From 97a0b63c8ad2cae7d6f4760b0119e37956877189 Mon Sep 17 00:00:00 2001
From: rahelMA <rahel.mandaroux@gmail.com>
Date: Fri, 6 Feb 2026 08:48:06 +0100
Subject: [PATCH 1/5] new realization + elasticity adj

---
 modules/41_emicapregi/TradingOnRef/bounds.gms | 29 ++++++++++++++
 .../41_emicapregi/TradingOnRef/datainput.gms  | 38 +++++++++++++++++++
 .../TradingOnRef/declarations.gms             | 23 +++++++++++
 .../41_emicapregi/TradingOnRef/not_used.txt   | 14 +++++++
 .../TradingOnRef/realization.gms              | 17 +++++++++
 modules/41_emicapregi/module.gms              |  1 +
 modules/80_optimization/nash/datainput.gms    |  6 +--
 modules/80_optimization/nash/equations.gms    |  2 +-
 modules/80_optimization/nash/preloop.gms      |  2 +-
 9 files changed, 127 insertions(+), 5 deletions(-)
 create mode 100755 modules/41_emicapregi/TradingOnRef/bounds.gms
 create mode 100755 modules/41_emicapregi/TradingOnRef/datainput.gms
 create mode 100755 modules/41_emicapregi/TradingOnRef/declarations.gms
 create mode 100755 modules/41_emicapregi/TradingOnRef/not_used.txt
 create mode 100755 modules/41_emicapregi/TradingOnRef/realization.gms

diff --git a/modules/41_emicapregi/TradingOnRef/bounds.gms b/modules/41_emicapregi/TradingOnRef/bounds.gms
new file mode 100755
index 0000000000..35c24768e6
--- /dev/null
+++ b/modules/41_emicapregi/TradingOnRef/bounds.gms
@@ -0,0 +1,29 @@
+*** |  (C) 2006-2024 Potsdam Institute for Climate Impact Research (PIK)
+*** |  authors, and contributors see CITATION.cff file. This file is part
+*** |  of REMIND and licensed under AGPL-3.0-or-later. Under Section 7 of
+*** |  AGPL-3.0, you are granted additional permissions described in the
+*** |  REMIND License Exception, version 1.0 (see LICENSE file).
+*** |  Contact: remind@pik-potsdam.de
+*** SOF ./modules/41_emicapregi/AbilityToPay/bounds.gms
+*** calculate emission cap in absolute terms
+vm_perm.fx(t,regi) = p41_co2eq(t,regi);
+
+display vm_perm.up;
+
+*** disactivate permit trade
+if(cm_permittradescen eq 2,
+vm_Xport.fx(t,regi,"perm") = 0;
+vm_Mport.fx(t,regi,"perm") = 0;
+);
+*** limited permit trade: limit in terms of share of allocated permits
+if(cm_permittradescen eq 3,
+vm_Xport.up(t,regi,"perm")$(t.val le 2060)=abs(20/100*(p41_co2eq(t,regi)));
+vm_Xport.up(t,regi,"perm")$(t.val gt 2060)=0;
+vm_Xport.up(t,regi,"perm")$(t.val le 2025)=0;
+vm_Xport.lo(t,regi,"perm") = 0;
+vm_Mport.up(t,regi,"perm")$(t.val le 2060)=abs(20/100*(p41_co2eq(t,regi)));
+vm_Mport.up(t,regi,"perm")$(t.val gt 2060)=0;
+vm_Mport.up(t,regi,"perm")$(t.val le 2025)=0;
+vm_Mport.lo(t,regi,"perm") = 0;
+);
+*** EOF ./modules/41_emicapregi/AbilityToPay/bounds.gms
diff --git a/modules/41_emicapregi/TradingOnRef/datainput.gms b/modules/41_emicapregi/TradingOnRef/datainput.gms
new file mode 100755
index 0000000000..ebe846937d
--- /dev/null
+++ b/modules/41_emicapregi/TradingOnRef/datainput.gms
@@ -0,0 +1,38 @@
+*** |  (C) 2006-2024 Potsdam Institute for Climate Impact Research (PIK)
+*** |  authors, and contributors see CITATION.cff file. This file is part
+*** |  of REMIND and licensed under AGPL-3.0-or-later. Under Section 7 of
+*** |  AGPL-3.0, you are granted additional permissions described in the
+*** |  REMIND License Exception, version 1.0 (see LICENSE file).
+*** |  Contact: remind@pik-potsdam.de
+*** SOF ./modules/41_emicapregi/AbilityToPay/datainput.gms
+
+
+*** read in data of cost-optimal reference climate policy run
+
+Execute_Loadpoint "input_ref" p41_co2eq_in = vm_emiAll.l;
+p41_co2eq(t, regi) = p41_co2eq_in(t,regi,"co2");
+
+
+*** read in data of baseline run
+Execute_Loadpoint "input_bau" p41_co2eq_bau = vm_co2eq.l;
+
+
+*** Step 1: calculate regional mitigation based on cost-optimal and baseline emissions, and per-capita gdp (pm_gdp is in MER, pm_shPPPMER is the MER-PPP multiplier, 1 for USA, and ~0.3 for IND)
+***p41_precorrection_reduction(t,regi) = (pm_gdp(t,regi)/pm_shPPPMER(regi)/pm_pop(t,regi)/(sum(regi2,pm_gdp(t,regi2)/pm_shPPPMER(regi2))/sum(regi2,pm_pop(t,regi2))))** 1/3 
+***										*sum(regi2,p41_co2eq_bau(t,regi2)-p41_co2eq(t,regi2))/sum(regi2,p41_co2eq_bau(t,regi2))
+***										*p41_co2eq_bau(t,regi);
+*** Step 2: Calculate correction factor
+***p41_correct_factor(t) = sum(regi2,p41_precorrection_reduction(t,regi2))/sum(regi2,p41_co2eq_bau(t,regi2)-p41_co2eq(t,regi2));
+
+*** Step 3 is directly done in modules/41_emicapregi/AbilityToPay/bounds.gms	 
+*** vm_perm.fx(t,regi) = p41_co2eq_bau(t,regi) - p41_precorrection_reduction(t,regi)/p41_correct_factor(t);
+
+*** initialization of pm_shPermit
+pm_shPerm(t,regi) = p41_co2eq(t,regi)/sum(regi2, p41_co2eq(t,regi2));		
+
+pm_emicapglob(t) = sum(regi, p41_co2eq(t,regi));
+
+*pm_shPerm(t,regi) = p41_emicapregi(t,regi)/sum(regi2, p41_emicapregi(t,regi2));
+*pm_emicapglob(t) = sum(regi, p41_emicapregi(t,regi));
+		 
+*** EOF ./modules/41_emicapregi/AbilityToPay/datainput.gms
diff --git a/modules/41_emicapregi/TradingOnRef/declarations.gms b/modules/41_emicapregi/TradingOnRef/declarations.gms
new file mode 100755
index 0000000000..60ea644bd8
--- /dev/null
+++ b/modules/41_emicapregi/TradingOnRef/declarations.gms
@@ -0,0 +1,23 @@
+*** |  (C) 2006-2024 Potsdam Institute for Climate Impact Research (PIK)
+*** |  authors, and contributors see CITATION.cff file. This file is part
+*** |  of REMIND and licensed under AGPL-3.0-or-later. Under Section 7 of
+*** |  AGPL-3.0, you are granted additional permissions described in the
+*** |  REMIND License Exception, version 1.0 (see LICENSE file).
+*** |  Contact: remind@pik-potsdam.de
+*** SOF ./modules/41_emicapregi/AbilityToPay/declarations.gms
+
+variables
+vm_perm(ttot,all_regi)                          "emission allowances [GtCeq]"
+;
+
+parameter
+pm_shPerm(tall, all_regi)                       "emission permit shares [share]"
+pm_emicapglob(tall)                             "global emission cap [GtC]" 
+p41_precorrection_reduction(tall,all_regi)      "reduction as calculated from 3rd root calculation, uncorrected "
+p41_correct_factor(tall)                        "correction factor so that global pathway matches"
+p41_co2eq_in(ttot,all_regi,all_enty)            "emissions from cost-optimal reference run"
+p41_co2eq(ttot,all_regi)                        "emissions from cost-optimal reference run"
+p41_co2eq_bau(ttot,all_regi)                    "emissions from no-policy baseline run"
+;
+
+*** EOF ./modules/41_emicapregi/AbilityToPay/declarations.gms
diff --git a/modules/41_emicapregi/TradingOnRef/not_used.txt b/modules/41_emicapregi/TradingOnRef/not_used.txt
new file mode 100755
index 0000000000..c3c03b1e35
--- /dev/null
+++ b/modules/41_emicapregi/TradingOnRef/not_used.txt
@@ -0,0 +1,14 @@
+# |  (C) 2006-2024 Potsdam Institute for Climate Impact Research (PIK)
+# |  authors, and contributors see CITATION.cff file. This file is part
+# |  of REMIND and licensed under AGPL-3.0-or-later. Under Section 7 of
+# |  AGPL-3.0, you are granted additional permissions described in the
+# |  REMIND License Exception, version 1.0 (see LICENSE file).
+# |  Contact: remind@pik-potsdam.de
+name, type, reason
+sm_budgetCO2eqGlob, parameter, ???
+pm_gdp_gdx, parameter, ???
+pm_budgetCO2eq, parameter, ???
+vm_co2eqGlob,input,questionnaire
+cm_emiscen,input,questionnaire
+p41_precorrection_reduction, parameter, ???
+p41_correct_factor, parameter, ???
diff --git a/modules/41_emicapregi/TradingOnRef/realization.gms b/modules/41_emicapregi/TradingOnRef/realization.gms
new file mode 100755
index 0000000000..05272d4483
--- /dev/null
+++ b/modules/41_emicapregi/TradingOnRef/realization.gms
@@ -0,0 +1,17 @@
+*** |  (C) 2006-2024 Potsdam Institute for Climate Impact Research (PIK)
+*** |  authors, and contributors see CITATION.cff file. This file is part
+*** |  of REMIND and licensed under AGPL-3.0-or-later. Under Section 7 of
+*** |  AGPL-3.0, you are granted additional permissions described in the
+*** |  REMIND License Exception, version 1.0 (see LICENSE file).
+*** |  Contact: remind@pik-potsdam.de
+*** SOF ./modules/41_emicapregi/AbilityToPay/realization.gms
+
+*' @description
+*' Emission caps/permits are allocated according to the ability to pay principle  
+
+*####################### R SECTION START (PHASES) ##############################
+$Ifi "%phase%" == "declarations" $include "./modules/41_emicapregi/TradingOnRef/declarations.gms"
+$Ifi "%phase%" == "datainput" $include "./modules/41_emicapregi/TradingOnRef/datainput.gms"
+$Ifi "%phase%" == "bounds" $include "./modules/41_emicapregi/TradingOnRef/bounds.gms"
+*######################## R SECTION END (PHASES) ###############################
+*** EOF ./modules/41_emicapregi/AbilityToPay/realization.gms
diff --git a/modules/41_emicapregi/module.gms b/modules/41_emicapregi/module.gms
index e8e89b5406..14ae2e4d0e 100644
--- a/modules/41_emicapregi/module.gms
+++ b/modules/41_emicapregi/module.gms
@@ -26,6 +26,7 @@ $Ifi "%emicapregi%" == "CandC" $include "./modules/41_emicapregi/CandC/realizati
 $Ifi "%emicapregi%" == "GDPint" $include "./modules/41_emicapregi/GDPint/realization.gms"
 $Ifi "%emicapregi%" == "POPint" $include "./modules/41_emicapregi/POPint/realization.gms"
 $Ifi "%emicapregi%" == "PerCapitaConvergence" $include "./modules/41_emicapregi/PerCapitaConvergence/realization.gms"
+$Ifi "%emicapregi%" == "TradingOnRef" $include "./modules/41_emicapregi/TradingOnRef/realization.gms"
 $Ifi "%emicapregi%" == "exog" $include "./modules/41_emicapregi/exog/realization.gms"
 $Ifi "%emicapregi%" == "none" $include "./modules/41_emicapregi/none/realization.gms"
 *###################### R SECTION END (MODULETYPES) ############################
diff --git a/modules/80_optimization/nash/datainput.gms b/modules/80_optimization/nash/datainput.gms
index 2588cb4055..c24ea97c16 100644
--- a/modules/80_optimization/nash/datainput.gms
+++ b/modules/80_optimization/nash/datainput.gms
@@ -37,7 +37,7 @@ cm_iteration_max = 100;
 ***convergences thresholds - very coarse 
   p80_surplusMaxTolerance(tradePe) = 2* 1.5 * sm_EJ_2_TWa;          !! convert EJ/yr into internal unit TWa
   p80_surplusMaxTolerance("good") = 2* 100/1000;                  !! in internal unit, trillion Dollar
-  p80_surplusMaxTolerance("perm") = 2* 300 * 12/44 / 1000;                !! convert MtCO2eq into internal unit GtC
+  p80_surplusMaxTolerance("perm") = 3* 300 * 12/44 / 1000;                !! convert MtCO2eq into internal unit GtC
    );
 );
     
@@ -54,12 +54,12 @@ p80_etaXp("perm") = 0.2;
 
 *LB* parameter for Nash price algorithm between different iterations
 p80_etaLT(trade) = 0;
-p80_etaLT("perm") = 0.03;
+p80_etaLT("perm") = 0.04;
 
 ***These parameters are pretty sensitive. If market surpluses diverge, try higher values (up to 1). If surpluses oscillate, try lower values. 
 p80_etaST(tradePe) = 0.3;
 p80_etaST("good") = 0.25;
-p80_etaST("perm") = 0.3;
+p80_etaST("perm") = 0.8;
 
 $ifi %banking% == "banking"  p80_etaST("perm") = 0.2;      !! in banking mode, the permit market reacts more sensitively.
 $ifi %emicapregi% == "budget"  p80_etaST("perm") = 0.25;      !! in budget mode, the permit market reacts more sensitively.
diff --git a/modules/80_optimization/nash/equations.gms b/modules/80_optimization/nash/equations.gms
index 8bc6b50d25..b7d46b2781 100644
--- a/modules/80_optimization/nash/equations.gms
+++ b/modules/80_optimization/nash/equations.gms
@@ -44,7 +44,7 @@ q80_costAdjNash(ttot,regi)$( ttot.val ge cm_startyear ) ..
 ;
 
 *' link between permit budget and  emission budget
-q80_budgetPermRestr(regi)$(cm_emiscen=6) ..
+q80_budgetPermRestr(regi)$(cm_emiscen=6 OR cm_emiscen = 4) ..
      sum(ttot$(ttot.val lt sm_endBudgetCO2eq and ttot.val ge cm_startyear), pm_ts(ttot)* vm_perm(ttot,regi))
      + sum(ttot$(ttot.val eq sm_endBudgetCO2eq),pm_ts(ttot)/2 * (vm_perm(ttot,regi)))  =l=
      pm_budgetCO2eq(regi) - sum(ttot $((ttot.val ge 2005) and (ttot.val lt cm_startyear)), pm_ts(ttot)* vm_co2eq(ttot,regi));
diff --git a/modules/80_optimization/nash/preloop.gms b/modules/80_optimization/nash/preloop.gms
index 9cf0c48be1..047e3b0e1c 100644
--- a/modules/80_optimization/nash/preloop.gms
+++ b/modules/80_optimization/nash/preloop.gms
@@ -65,7 +65,7 @@ if(p80_Mport0("2005",regi,tradePe) eq NA, p80_Mport0("2005",regi,tradePe) = 0);
 if((cm_emiscen ne 1) and (cm_emiscen ne 9) and (smax(t,pm_pvp(t,"perm"))) eq 0,
  loop(ttot$(ttot.val ge 2005),
 ***this is a 30$/tCo2eq in 2020 trajectory:     
-	pm_pvp(ttot,"perm") = 0.11*1.05**(ttot.val-2020) * pm_pvp(ttot,"good");
+	pm_pvp(ttot,"perm") = 0.18*1.05**(ttot.val-2020) * pm_pvp(ttot,"good");
  );
  pm_pvp("2005","perm")=0;
 );

From ba18b2b013bdf34292ec397f511ebae0364d04f2 Mon Sep 17 00:00:00 2001
From: rahelMA <rahel.mandaroux@gmail.com>
Date: Thu, 12 Feb 2026 10:38:46 +0100
Subject: [PATCH 2/5] switches for restricted permit trading

---
 main.gms                                           | 13 ++++++++++++-
 modules/41_emicapregi/TradingOnRef/bounds.gms      |  8 ++++----
 modules/41_emicapregi/TradingOnRef/datainput.gms   | 13 -------------
 modules/41_emicapregi/TradingOnRef/realization.gms | 11 +++++++++--
 4 files changed, 25 insertions(+), 20 deletions(-)

diff --git a/main.gms b/main.gms
index 1b15f37a62..af90cc1f40 100755
--- a/main.gms
+++ b/main.gms
@@ -817,7 +817,18 @@ parameter
   cm_permittradescen  = 1;         !! def = 1  !! regexp = [1-3]
 *' *  (1): full permit trade (no restrictions)
 *' *  (2): no permit trade (only domestic mitigation)
-*' *  (3): limited trade (certain percentage of GDP)
+*' *  (3): limited trade (certain percentage of permits)
+*'
+parameter
+  cm_pemittradefinalyr        "Year until permit trading is allowed"
+;
+  cm_pemittradefinalyr  = 2060;         !! def = 2060
+*'  
+
+parameter
+  cm_pemittraderatio        "Percentage of restricted permit trading"
+;
+  cm_pemittraderatio  = 0.2;         !! def = 0.2  
 *'
 parameter
   cm_rentdiscoil            "[grades2poly] discount factor for the oil rent"
diff --git a/modules/41_emicapregi/TradingOnRef/bounds.gms b/modules/41_emicapregi/TradingOnRef/bounds.gms
index 35c24768e6..a414ffa85f 100755
--- a/modules/41_emicapregi/TradingOnRef/bounds.gms
+++ b/modules/41_emicapregi/TradingOnRef/bounds.gms
@@ -17,12 +17,12 @@ vm_Mport.fx(t,regi,"perm") = 0;
 );
 *** limited permit trade: limit in terms of share of allocated permits
 if(cm_permittradescen eq 3,
-vm_Xport.up(t,regi,"perm")$(t.val le 2060)=abs(20/100*(p41_co2eq(t,regi)));
-vm_Xport.up(t,regi,"perm")$(t.val gt 2060)=0;
+vm_Xport.up(t,regi,"perm")$(t.val le cm_pemittradefinalyr)=abs(cm_pemittraderatio*(p41_co2eq(t,regi)));
+vm_Xport.up(t,regi,"perm")$(t.val gt cm_pemittradefinalyr)=0;
 vm_Xport.up(t,regi,"perm")$(t.val le 2025)=0;
 vm_Xport.lo(t,regi,"perm") = 0;
-vm_Mport.up(t,regi,"perm")$(t.val le 2060)=abs(20/100*(p41_co2eq(t,regi)));
-vm_Mport.up(t,regi,"perm")$(t.val gt 2060)=0;
+vm_Mport.up(t,regi,"perm")$(t.val le cm_pemittradefinalyr)=abs(cm_pemittraderatio*(p41_co2eq(t,regi)));
+vm_Mport.up(t,regi,"perm")$(t.val gt cm_pemittradefinalyr)=0;
 vm_Mport.up(t,regi,"perm")$(t.val le 2025)=0;
 vm_Mport.lo(t,regi,"perm") = 0;
 );
diff --git a/modules/41_emicapregi/TradingOnRef/datainput.gms b/modules/41_emicapregi/TradingOnRef/datainput.gms
index ebe846937d..0400b10923 100755
--- a/modules/41_emicapregi/TradingOnRef/datainput.gms
+++ b/modules/41_emicapregi/TradingOnRef/datainput.gms
@@ -17,22 +17,9 @@ p41_co2eq(t, regi) = p41_co2eq_in(t,regi,"co2");
 Execute_Loadpoint "input_bau" p41_co2eq_bau = vm_co2eq.l;
 
 
-*** Step 1: calculate regional mitigation based on cost-optimal and baseline emissions, and per-capita gdp (pm_gdp is in MER, pm_shPPPMER is the MER-PPP multiplier, 1 for USA, and ~0.3 for IND)
-***p41_precorrection_reduction(t,regi) = (pm_gdp(t,regi)/pm_shPPPMER(regi)/pm_pop(t,regi)/(sum(regi2,pm_gdp(t,regi2)/pm_shPPPMER(regi2))/sum(regi2,pm_pop(t,regi2))))** 1/3 
-***										*sum(regi2,p41_co2eq_bau(t,regi2)-p41_co2eq(t,regi2))/sum(regi2,p41_co2eq_bau(t,regi2))
-***										*p41_co2eq_bau(t,regi);
-*** Step 2: Calculate correction factor
-***p41_correct_factor(t) = sum(regi2,p41_precorrection_reduction(t,regi2))/sum(regi2,p41_co2eq_bau(t,regi2)-p41_co2eq(t,regi2));
-
-*** Step 3 is directly done in modules/41_emicapregi/AbilityToPay/bounds.gms	 
-*** vm_perm.fx(t,regi) = p41_co2eq_bau(t,regi) - p41_precorrection_reduction(t,regi)/p41_correct_factor(t);
-
 *** initialization of pm_shPermit
 pm_shPerm(t,regi) = p41_co2eq(t,regi)/sum(regi2, p41_co2eq(t,regi2));		
-
 pm_emicapglob(t) = sum(regi, p41_co2eq(t,regi));
 
-*pm_shPerm(t,regi) = p41_emicapregi(t,regi)/sum(regi2, p41_emicapregi(t,regi2));
-*pm_emicapglob(t) = sum(regi, p41_emicapregi(t,regi));
 		 
 *** EOF ./modules/41_emicapregi/AbilityToPay/datainput.gms
diff --git a/modules/41_emicapregi/TradingOnRef/realization.gms b/modules/41_emicapregi/TradingOnRef/realization.gms
index 05272d4483..3ab46225aa 100755
--- a/modules/41_emicapregi/TradingOnRef/realization.gms
+++ b/modules/41_emicapregi/TradingOnRef/realization.gms
@@ -6,8 +6,15 @@
 *** |  Contact: remind@pik-potsdam.de
 *** SOF ./modules/41_emicapregi/AbilityToPay/realization.gms
 
-*' @description
-*' Emission caps/permits are allocated according to the ability to pay principle  
+*' @description: Emission caps/permits are allocated according to a reference run
+*' There are three different trade patterns currently available.
+*'     cm_permittradescen  = 1;         !! def = 1  !! regexp = [1-3]
+*' *  (1): full permit trade (no restrictions)
+*' *  (2): no permit trade (only domestic mitigation)
+*' *  (3): limited trade (certain percentage of regional allowances)
+*'         for limited trade use cm_pemittradefinalyr   to set the final year until permit trading is allowed
+*'         with cm_pemittraderatio set the percentage of allowed trade
+
 
 *####################### R SECTION START (PHASES) ##############################
 $Ifi "%phase%" == "declarations" $include "./modules/41_emicapregi/TradingOnRef/declarations.gms"

From f4af591de76d622c9c25f1ca179e781fe4429d01 Mon Sep 17 00:00:00 2001
From: rahelMA <rahel.mandaroux@gmail.com>
Date: Thu, 12 Feb 2026 14:09:02 +0100
Subject: [PATCH 3/5] cleaning not used

---
 modules/41_emicapregi/AbilityToPay/not_used.txt         | 2 ++
 modules/41_emicapregi/CandC/not_used.txt                | 2 ++
 modules/41_emicapregi/GDPint/not_used.txt               | 2 ++
 modules/41_emicapregi/POPint/not_used.txt               | 2 ++
 modules/41_emicapregi/PerCapitaConvergence/not_used.txt | 2 ++
 modules/41_emicapregi/TradingOnRef/declarations.gms     | 2 --
 modules/41_emicapregi/TradingOnRef/not_used.txt         | 3 +++
 modules/41_emicapregi/exog/not_used.txt                 | 2 ++
 modules/41_emicapregi/none/not_used.txt                 | 2 ++
 9 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/modules/41_emicapregi/AbilityToPay/not_used.txt b/modules/41_emicapregi/AbilityToPay/not_used.txt
index 009a793d19..479771833d 100644
--- a/modules/41_emicapregi/AbilityToPay/not_used.txt
+++ b/modules/41_emicapregi/AbilityToPay/not_used.txt
@@ -10,3 +10,5 @@ pm_gdp_gdx, parameter, ???
 pm_budgetCO2eq, parameter, ???
 vm_co2eqGlob,input,questionnaire
 cm_emiscen,input,questionnaire
+cm_pemittradefinalyr, input, ???
+cm_pemittraderatio, input, ???
diff --git a/modules/41_emicapregi/CandC/not_used.txt b/modules/41_emicapregi/CandC/not_used.txt
index e7413e8496..9553ed69e4 100644
--- a/modules/41_emicapregi/CandC/not_used.txt
+++ b/modules/41_emicapregi/CandC/not_used.txt
@@ -13,3 +13,5 @@ pm_budgetCO2eq, parameter, ???
 pm_shPPPMER,input,questionnaire
 pm_gdp,input,questionnaire
 cm_permittradescen,input,questionnaire
+cm_pemittradefinalyr, input, ???
+cm_pemittraderatio, input, ???
diff --git a/modules/41_emicapregi/GDPint/not_used.txt b/modules/41_emicapregi/GDPint/not_used.txt
index 22f931e772..36a64e4694 100644
--- a/modules/41_emicapregi/GDPint/not_used.txt
+++ b/modules/41_emicapregi/GDPint/not_used.txt
@@ -13,3 +13,5 @@ pm_budgetCO2eq, parameter, ???
 pm_shPPPMER,input,questionnaire
 pm_gdp,input,questionnaire
 cm_permittradescen,input,questionnaire
+cm_pemittradefinalyr, input, ???
+cm_pemittraderatio, input, ???
diff --git a/modules/41_emicapregi/POPint/not_used.txt b/modules/41_emicapregi/POPint/not_used.txt
index 1f082f491d..4f518d993f 100644
--- a/modules/41_emicapregi/POPint/not_used.txt
+++ b/modules/41_emicapregi/POPint/not_used.txt
@@ -11,3 +11,5 @@ vm_Mport,input,questionnaire
 pm_shPPPMER,input,questionnaire
 pm_gdp,input,questionnaire
 cm_permittradescen,input,questionnaire
+cm_pemittradefinalyr, input, ???
+cm_pemittraderatio, input, ???
\ No newline at end of file
diff --git a/modules/41_emicapregi/PerCapitaConvergence/not_used.txt b/modules/41_emicapregi/PerCapitaConvergence/not_used.txt
index 78c95ab216..e11f91edf2 100644
--- a/modules/41_emicapregi/PerCapitaConvergence/not_used.txt
+++ b/modules/41_emicapregi/PerCapitaConvergence/not_used.txt
@@ -12,3 +12,5 @@ vm_co2eqGlob,input,questionnaire
 pm_shPPPMER,input,questionnaire
 pm_gdp,input,questionnaire
 cm_emiscen,input,questionnaire
+cm_pemittradefinalyr, input, ???
+cm_pemittraderatio, input, ???
\ No newline at end of file
diff --git a/modules/41_emicapregi/TradingOnRef/declarations.gms b/modules/41_emicapregi/TradingOnRef/declarations.gms
index 60ea644bd8..6d050ace1a 100755
--- a/modules/41_emicapregi/TradingOnRef/declarations.gms
+++ b/modules/41_emicapregi/TradingOnRef/declarations.gms
@@ -13,8 +13,6 @@ vm_perm(ttot,all_regi)                          "emission allowances [GtCeq]"
 parameter
 pm_shPerm(tall, all_regi)                       "emission permit shares [share]"
 pm_emicapglob(tall)                             "global emission cap [GtC]" 
-p41_precorrection_reduction(tall,all_regi)      "reduction as calculated from 3rd root calculation, uncorrected "
-p41_correct_factor(tall)                        "correction factor so that global pathway matches"
 p41_co2eq_in(ttot,all_regi,all_enty)            "emissions from cost-optimal reference run"
 p41_co2eq(ttot,all_regi)                        "emissions from cost-optimal reference run"
 p41_co2eq_bau(ttot,all_regi)                    "emissions from no-policy baseline run"
diff --git a/modules/41_emicapregi/TradingOnRef/not_used.txt b/modules/41_emicapregi/TradingOnRef/not_used.txt
index c3c03b1e35..0913d7de02 100755
--- a/modules/41_emicapregi/TradingOnRef/not_used.txt
+++ b/modules/41_emicapregi/TradingOnRef/not_used.txt
@@ -12,3 +12,6 @@ vm_co2eqGlob,input,questionnaire
 cm_emiscen,input,questionnaire
 p41_precorrection_reduction, parameter, ???
 p41_correct_factor, parameter, ???
+pm_shPPPMER,input,questionnaire
+pm_pop, parameter, ???
+pm_gdp,input,questionnaire
\ No newline at end of file
diff --git a/modules/41_emicapregi/exog/not_used.txt b/modules/41_emicapregi/exog/not_used.txt
index ad24171408..665dc85d89 100644
--- a/modules/41_emicapregi/exog/not_used.txt
+++ b/modules/41_emicapregi/exog/not_used.txt
@@ -16,3 +16,5 @@ cm_emiscen, switch, ???
 pm_shPPPMER,input,questionnair
 pm_gdp,input,questionnaire
 cm_permittradescen,input,questionnaire
+cm_pemittradefinalyr, input, ???
+cm_pemittraderatio, input, ???
diff --git a/modules/41_emicapregi/none/not_used.txt b/modules/41_emicapregi/none/not_used.txt
index f08fbec934..55be269068 100644
--- a/modules/41_emicapregi/none/not_used.txt
+++ b/modules/41_emicapregi/none/not_used.txt
@@ -14,3 +14,5 @@ cm_emiscen, switch, ???
 pm_shPPPMER,input,questionnaire
 pm_gdp,input,questionnaire
 cm_permittradescen,input,questionnaire
+cm_pemittradefinalyr, input, ???
+cm_pemittraderatio, input, ???

From 3b0ad2ab551439c5d054040e9f7aa8bf11005474 Mon Sep 17 00:00:00 2001
From: rahelMA <rahel.mandaroux@gmail.com>
Date: Mon, 16 Feb 2026 15:52:11 +0100
Subject: [PATCH 4/5] code cleaning

---
 main.gms                                       |  8 ++++----
 modules/41_emicapregi/TradingOnRef/bounds.gms  | 18 +++++++-----------
 .../41_emicapregi/TradingOnRef/datainput.gms   | 11 ++++-------
 .../TradingOnRef/declarations.gms              |  5 ++---
 .../41_emicapregi/TradingOnRef/not_used.txt    |  3 ++-
 .../41_emicapregi/TradingOnRef/realization.gms |  4 ++--
 modules/80_optimization/nash/preloop.gms       |  4 ++--
 7 files changed, 23 insertions(+), 30 deletions(-)

diff --git a/main.gms b/main.gms
index af90cc1f40..819bdc4ff6 100755
--- a/main.gms
+++ b/main.gms
@@ -820,15 +820,15 @@ parameter
 *' *  (3): limited trade (certain percentage of permits)
 *'
 parameter
-  cm_pemittradefinalyr        "Year until permit trading is allowed"
+  cm_permitTradeFinalYr        "Year until permit trading is allowed"
 ;
-  cm_pemittradefinalyr  = 2060;         !! def = 2060
+  cm_permitTradeFinalYr  = 2100;         !! def = 2100
 *'  
 
 parameter
-  cm_pemittraderatio        "Percentage of restricted permit trading"
+  cm_permitTradeRatio        "Percentage of restricted permit trading"
 ;
-  cm_pemittraderatio  = 0.2;         !! def = 0.2  
+  cm_permitTradeRatio  = 0.2;         !! def = 0.2  
 *'
 parameter
   cm_rentdiscoil            "[grades2poly] discount factor for the oil rent"
diff --git a/modules/41_emicapregi/TradingOnRef/bounds.gms b/modules/41_emicapregi/TradingOnRef/bounds.gms
index a414ffa85f..b186a9c62b 100755
--- a/modules/41_emicapregi/TradingOnRef/bounds.gms
+++ b/modules/41_emicapregi/TradingOnRef/bounds.gms
@@ -4,26 +4,22 @@
 *** |  AGPL-3.0, you are granted additional permissions described in the
 *** |  REMIND License Exception, version 1.0 (see LICENSE file).
 *** |  Contact: remind@pik-potsdam.de
-*** SOF ./modules/41_emicapregi/AbilityToPay/bounds.gms
+*** SOF ./modules/41_emicapregi/TradingOnRef/bounds.gms
 *** calculate emission cap in absolute terms
 vm_perm.fx(t,regi) = p41_co2eq(t,regi);
 
 display vm_perm.up;
 
-*** disactivate permit trade
+*** deactivate permit trade
 if(cm_permittradescen eq 2,
 vm_Xport.fx(t,regi,"perm") = 0;
 vm_Mport.fx(t,regi,"perm") = 0;
 );
 *** limited permit trade: limit in terms of share of allocated permits
 if(cm_permittradescen eq 3,
-vm_Xport.up(t,regi,"perm")$(t.val le cm_pemittradefinalyr)=abs(cm_pemittraderatio*(p41_co2eq(t,regi)));
-vm_Xport.up(t,regi,"perm")$(t.val gt cm_pemittradefinalyr)=0;
-vm_Xport.up(t,regi,"perm")$(t.val le 2025)=0;
-vm_Xport.lo(t,regi,"perm") = 0;
-vm_Mport.up(t,regi,"perm")$(t.val le cm_pemittradefinalyr)=abs(cm_pemittraderatio*(p41_co2eq(t,regi)));
-vm_Mport.up(t,regi,"perm")$(t.val gt cm_pemittradefinalyr)=0;
-vm_Mport.up(t,regi,"perm")$(t.val le 2025)=0;
-vm_Mport.lo(t,regi,"perm") = 0;
+vm_Xport.fx(t,regi,"perm") = 0;
+vm_Xport.up(t,regi,"perm") $ (t.val > 2025 and t.val <= cm_permitTradeFinalYr) = cm_permitTradeRatio * abs(p41_co2eq(t,regi));
+vm_Mport.fx(t,regi,"perm") = 0;
+vm_Mport.up(t,regi,"perm") $ (t.val > 2025 and t.val <= cm_permitTradeFinalYr) = cm_permitTradeRatio * abs(p41_co2eq(t,regi));
 );
-*** EOF ./modules/41_emicapregi/AbilityToPay/bounds.gms
+*** EOF ./modules/41_emicapregi/TradingOnRef/bounds.gms
diff --git a/modules/41_emicapregi/TradingOnRef/datainput.gms b/modules/41_emicapregi/TradingOnRef/datainput.gms
index 0400b10923..6ca8b2bb39 100755
--- a/modules/41_emicapregi/TradingOnRef/datainput.gms
+++ b/modules/41_emicapregi/TradingOnRef/datainput.gms
@@ -4,22 +4,19 @@
 *** |  AGPL-3.0, you are granted additional permissions described in the
 *** |  REMIND License Exception, version 1.0 (see LICENSE file).
 *** |  Contact: remind@pik-potsdam.de
-*** SOF ./modules/41_emicapregi/AbilityToPay/datainput.gms
+*** SOF ./modules/41_emicapregi/TradingOnRef/datainput.gms
 
 
 *** read in data of cost-optimal reference climate policy run
+*' load CO2 emissions from reference run to assing the allocates permits
 
 Execute_Loadpoint "input_ref" p41_co2eq_in = vm_emiAll.l;
 p41_co2eq(t, regi) = p41_co2eq_in(t,regi,"co2");
 
 
-*** read in data of baseline run
-Execute_Loadpoint "input_bau" p41_co2eq_bau = vm_co2eq.l;
-
-
 *** initialization of pm_shPermit
-pm_shPerm(t,regi) = p41_co2eq(t,regi)/sum(regi2, p41_co2eq(t,regi2));		
 pm_emicapglob(t) = sum(regi, p41_co2eq(t,regi));
+pm_shPerm(t,regi) = p41_co2eq(t,regi) / pm_emicapglob(t);
 
 		 
-*** EOF ./modules/41_emicapregi/AbilityToPay/datainput.gms
+*** EOF ./modules/41_emicapregi/TradingOnRef/datainput.gms
diff --git a/modules/41_emicapregi/TradingOnRef/declarations.gms b/modules/41_emicapregi/TradingOnRef/declarations.gms
index 6d050ace1a..37ad76b9ab 100755
--- a/modules/41_emicapregi/TradingOnRef/declarations.gms
+++ b/modules/41_emicapregi/TradingOnRef/declarations.gms
@@ -4,7 +4,7 @@
 *** |  AGPL-3.0, you are granted additional permissions described in the
 *** |  REMIND License Exception, version 1.0 (see LICENSE file).
 *** |  Contact: remind@pik-potsdam.de
-*** SOF ./modules/41_emicapregi/AbilityToPay/declarations.gms
+*** SOF ./modules/41_emicapregi/TradingOnRef/declarations.gms
 
 variables
 vm_perm(ttot,all_regi)                          "emission allowances [GtCeq]"
@@ -15,7 +15,6 @@ pm_shPerm(tall, all_regi)                       "emission permit shares [share]"
 pm_emicapglob(tall)                             "global emission cap [GtC]" 
 p41_co2eq_in(ttot,all_regi,all_enty)            "emissions from cost-optimal reference run"
 p41_co2eq(ttot,all_regi)                        "emissions from cost-optimal reference run"
-p41_co2eq_bau(ttot,all_regi)                    "emissions from no-policy baseline run"
 ;
 
-*** EOF ./modules/41_emicapregi/AbilityToPay/declarations.gms
+*** EOF ./modules/41_emicapregi/TradingOnRef/declarations.gms
diff --git a/modules/41_emicapregi/TradingOnRef/not_used.txt b/modules/41_emicapregi/TradingOnRef/not_used.txt
index 0913d7de02..0580ec5176 100755
--- a/modules/41_emicapregi/TradingOnRef/not_used.txt
+++ b/modules/41_emicapregi/TradingOnRef/not_used.txt
@@ -14,4 +14,5 @@ p41_precorrection_reduction, parameter, ???
 p41_correct_factor, parameter, ???
 pm_shPPPMER,input,questionnaire
 pm_pop, parameter, ???
-pm_gdp,input,questionnaire
\ No newline at end of file
+pm_gdp,input,questionnaire
+p41_co2eq_bau, parameter, ???
\ No newline at end of file
diff --git a/modules/41_emicapregi/TradingOnRef/realization.gms b/modules/41_emicapregi/TradingOnRef/realization.gms
index 3ab46225aa..f1229f9770 100755
--- a/modules/41_emicapregi/TradingOnRef/realization.gms
+++ b/modules/41_emicapregi/TradingOnRef/realization.gms
@@ -4,7 +4,7 @@
 *** |  AGPL-3.0, you are granted additional permissions described in the
 *** |  REMIND License Exception, version 1.0 (see LICENSE file).
 *** |  Contact: remind@pik-potsdam.de
-*** SOF ./modules/41_emicapregi/AbilityToPay/realization.gms
+*** SOF ./modules/41_emicapregi/TradingOnRef/realization.gms
 
 *' @description: Emission caps/permits are allocated according to a reference run
 *' There are three different trade patterns currently available.
@@ -21,4 +21,4 @@ $Ifi "%phase%" == "declarations" $include "./modules/41_emicapregi/TradingOnRef/
 $Ifi "%phase%" == "datainput" $include "./modules/41_emicapregi/TradingOnRef/datainput.gms"
 $Ifi "%phase%" == "bounds" $include "./modules/41_emicapregi/TradingOnRef/bounds.gms"
 *######################## R SECTION END (PHASES) ###############################
-*** EOF ./modules/41_emicapregi/AbilityToPay/realization.gms
+*** EOF ./modules/41_emicapregi/TradingOnRef/realization.gms
diff --git a/modules/80_optimization/nash/preloop.gms b/modules/80_optimization/nash/preloop.gms
index 047e3b0e1c..6600873cd9 100644
--- a/modules/80_optimization/nash/preloop.gms
+++ b/modules/80_optimization/nash/preloop.gms
@@ -61,10 +61,10 @@ loop(regi,
 if(p80_Mport0("2005",regi,tradePe) eq NA, p80_Mport0("2005",regi,tradePe) = 0);
 ););
 
-*AJS* starting policy runs from permit prices that are all zero doesnot work. start from 30$ price path instead
+*AJS* starting policy runs from permit prices that are all zero doesnot work. start from 49$ price path instead
 if((cm_emiscen ne 1) and (cm_emiscen ne 9) and (smax(t,pm_pvp(t,"perm"))) eq 0,
  loop(ttot$(ttot.val ge 2005),
-***this is a 30$/tCo2eq in 2020 trajectory:     
+***this is a 49$/tCo2eq in 2020 trajectory ([T$/GtC]. To get $/tCO2, multiply with 272: 0.18 T$/GtC = 48.96 $/tCO2):     
 	pm_pvp(ttot,"perm") = 0.18*1.05**(ttot.val-2020) * pm_pvp(ttot,"good");
  );
  pm_pvp("2005","perm")=0;

From b711406ded45825ac71239049eb78a81e68be98f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fabrice=20L=C3=A9cuyer?= <lecfab+git@gmail.com>
Date: Mon, 2 Mar 2026 13:41:21 +0000
Subject: [PATCH 5/5] Implementing suggestions: renaming switches everywhere,
 using cm_permitTradeRatio instead of cm_permittradescen to describe the
 trading scenario

---
 main.gms                                           |  8 ++++----
 modules/41_emicapregi/AbilityToPay/not_used.txt    |  4 ++--
 modules/41_emicapregi/CandC/not_used.txt           |  4 ++--
 modules/41_emicapregi/GDPint/not_used.txt          |  4 ++--
 modules/41_emicapregi/POPint/not_used.txt          |  4 ++--
 .../PerCapitaConvergence/not_used.txt              |  4 ++--
 modules/41_emicapregi/TradingOnRef/bounds.gms      | 14 ++++++--------
 modules/41_emicapregi/TradingOnRef/not_used.txt    |  3 ++-
 modules/41_emicapregi/TradingOnRef/realization.gms |  4 ++--
 modules/41_emicapregi/exog/not_used.txt            |  4 ++--
 modules/41_emicapregi/none/not_used.txt            |  4 ++--
 11 files changed, 28 insertions(+), 29 deletions(-)

diff --git a/main.gms b/main.gms
index 819bdc4ff6..93c97bee49 100755
--- a/main.gms
+++ b/main.gms
@@ -812,21 +812,21 @@ parameter
 *' *  (3): all GHG excl CO2 emissions from LULUCF
 *'
 parameter
-  cm_permittradescen        "scenario on permit trade"
+  cm_permittradescen        "Scenario on permit trade, not used in the TradingOnRef realisation"
 ;
   cm_permittradescen  = 1;         !! def = 1  !! regexp = [1-3]
 *' *  (1): full permit trade (no restrictions)
 *' *  (2): no permit trade (only domestic mitigation)
 *' *  (3): limited trade (certain percentage of permits)
 *'
+
 parameter
-  cm_permitTradeFinalYr        "Year until permit trading is allowed"
+  cm_permitTradeFinalYr        "[TradingOnRef] Year until permit trading is allowed"
 ;
   cm_permitTradeFinalYr  = 2100;         !! def = 2100
 *'  
-
 parameter
-  cm_permitTradeRatio        "Percentage of restricted permit trading"
+  cm_permitTradeRatio        "[TradingOnRef] Share of emissions allowed for permit trading between 0 and 1"
 ;
   cm_permitTradeRatio  = 0.2;         !! def = 0.2  
 *'
diff --git a/modules/41_emicapregi/AbilityToPay/not_used.txt b/modules/41_emicapregi/AbilityToPay/not_used.txt
index 479771833d..3131f6520b 100644
--- a/modules/41_emicapregi/AbilityToPay/not_used.txt
+++ b/modules/41_emicapregi/AbilityToPay/not_used.txt
@@ -10,5 +10,5 @@ pm_gdp_gdx, parameter, ???
 pm_budgetCO2eq, parameter, ???
 vm_co2eqGlob,input,questionnaire
 cm_emiscen,input,questionnaire
-cm_pemittradefinalyr, input, ???
-cm_pemittraderatio, input, ???
+cm_permitTradeFinalYr, input, ???
+cm_permitTradeRatio, input, ???
diff --git a/modules/41_emicapregi/CandC/not_used.txt b/modules/41_emicapregi/CandC/not_used.txt
index 9553ed69e4..b3699610aa 100644
--- a/modules/41_emicapregi/CandC/not_used.txt
+++ b/modules/41_emicapregi/CandC/not_used.txt
@@ -13,5 +13,5 @@ pm_budgetCO2eq, parameter, ???
 pm_shPPPMER,input,questionnaire
 pm_gdp,input,questionnaire
 cm_permittradescen,input,questionnaire
-cm_pemittradefinalyr, input, ???
-cm_pemittraderatio, input, ???
+cm_permitTradeFinalYr, input, ???
+cm_permitTradeRatio, input, ???
diff --git a/modules/41_emicapregi/GDPint/not_used.txt b/modules/41_emicapregi/GDPint/not_used.txt
index 36a64e4694..4a39a3e606 100644
--- a/modules/41_emicapregi/GDPint/not_used.txt
+++ b/modules/41_emicapregi/GDPint/not_used.txt
@@ -13,5 +13,5 @@ pm_budgetCO2eq, parameter, ???
 pm_shPPPMER,input,questionnaire
 pm_gdp,input,questionnaire
 cm_permittradescen,input,questionnaire
-cm_pemittradefinalyr, input, ???
-cm_pemittraderatio, input, ???
+cm_permitTradeFinalYr, input, ???
+cm_permitTradeRatio, input, ???
diff --git a/modules/41_emicapregi/POPint/not_used.txt b/modules/41_emicapregi/POPint/not_used.txt
index 4f518d993f..f3df1eafc1 100644
--- a/modules/41_emicapregi/POPint/not_used.txt
+++ b/modules/41_emicapregi/POPint/not_used.txt
@@ -11,5 +11,5 @@ vm_Mport,input,questionnaire
 pm_shPPPMER,input,questionnaire
 pm_gdp,input,questionnaire
 cm_permittradescen,input,questionnaire
-cm_pemittradefinalyr, input, ???
-cm_pemittraderatio, input, ???
\ No newline at end of file
+cm_permitTradeFinalYr, input, ???
+cm_permitTradeRatio, input, ???
\ No newline at end of file
diff --git a/modules/41_emicapregi/PerCapitaConvergence/not_used.txt b/modules/41_emicapregi/PerCapitaConvergence/not_used.txt
index e11f91edf2..7f60d3e45d 100644
--- a/modules/41_emicapregi/PerCapitaConvergence/not_used.txt
+++ b/modules/41_emicapregi/PerCapitaConvergence/not_used.txt
@@ -12,5 +12,5 @@ vm_co2eqGlob,input,questionnaire
 pm_shPPPMER,input,questionnaire
 pm_gdp,input,questionnaire
 cm_emiscen,input,questionnaire
-cm_pemittradefinalyr, input, ???
-cm_pemittraderatio, input, ???
\ No newline at end of file
+cm_permitTradeFinalYr, input, ???
+cm_permitTradeRatio, input, ???
\ No newline at end of file
diff --git a/modules/41_emicapregi/TradingOnRef/bounds.gms b/modules/41_emicapregi/TradingOnRef/bounds.gms
index b186a9c62b..ee62ca0773 100755
--- a/modules/41_emicapregi/TradingOnRef/bounds.gms
+++ b/modules/41_emicapregi/TradingOnRef/bounds.gms
@@ -5,21 +5,19 @@
 *** |  REMIND License Exception, version 1.0 (see LICENSE file).
 *** |  Contact: remind@pik-potsdam.de
 *** SOF ./modules/41_emicapregi/TradingOnRef/bounds.gms
+
 *** calculate emission cap in absolute terms
 vm_perm.fx(t,regi) = p41_co2eq(t,regi);
 
 display vm_perm.up;
 
-*** deactivate permit trade
-if(cm_permittradescen eq 2,
 vm_Xport.fx(t,regi,"perm") = 0;
 vm_Mport.fx(t,regi,"perm") = 0;
-);
-*** limited permit trade: limit in terms of share of allocated permits
-if(cm_permittradescen eq 3,
-vm_Xport.fx(t,regi,"perm") = 0;
+
+*** Only activate permit trade between 2030 and cm_permitTradeFinalYr
+*** cm_permitTradeRatio determines the proportion of emissions that can be traded,
+*** between 0 (no permit trade allowed) and 1 (all emissions can be traded)
 vm_Xport.up(t,regi,"perm") $ (t.val > 2025 and t.val <= cm_permitTradeFinalYr) = cm_permitTradeRatio * abs(p41_co2eq(t,regi));
-vm_Mport.fx(t,regi,"perm") = 0;
 vm_Mport.up(t,regi,"perm") $ (t.val > 2025 and t.val <= cm_permitTradeFinalYr) = cm_permitTradeRatio * abs(p41_co2eq(t,regi));
-);
+
 *** EOF ./modules/41_emicapregi/TradingOnRef/bounds.gms
diff --git a/modules/41_emicapregi/TradingOnRef/not_used.txt b/modules/41_emicapregi/TradingOnRef/not_used.txt
index 0580ec5176..f8db314466 100755
--- a/modules/41_emicapregi/TradingOnRef/not_used.txt
+++ b/modules/41_emicapregi/TradingOnRef/not_used.txt
@@ -15,4 +15,5 @@ p41_correct_factor, parameter, ???
 pm_shPPPMER,input,questionnaire
 pm_pop, parameter, ???
 pm_gdp,input,questionnaire
-p41_co2eq_bau, parameter, ???
\ No newline at end of file
+p41_co2eq_bau, parameter, ???
+cm_permittradescen,input,replaced by cm_permitTradeRatio
\ No newline at end of file
diff --git a/modules/41_emicapregi/TradingOnRef/realization.gms b/modules/41_emicapregi/TradingOnRef/realization.gms
index f1229f9770..86759e4cae 100755
--- a/modules/41_emicapregi/TradingOnRef/realization.gms
+++ b/modules/41_emicapregi/TradingOnRef/realization.gms
@@ -12,8 +12,8 @@
 *' *  (1): full permit trade (no restrictions)
 *' *  (2): no permit trade (only domestic mitigation)
 *' *  (3): limited trade (certain percentage of regional allowances)
-*'         for limited trade use cm_pemittradefinalyr   to set the final year until permit trading is allowed
-*'         with cm_pemittraderatio set the percentage of allowed trade
+*'         for limited trade use cm_permitTradeFinalYr   to set the final year until permit trading is allowed
+*'         with cm_permitTradeRatio set the percentage of allowed trade
 
 
 *####################### R SECTION START (PHASES) ##############################
diff --git a/modules/41_emicapregi/exog/not_used.txt b/modules/41_emicapregi/exog/not_used.txt
index 665dc85d89..5e9156d090 100644
--- a/modules/41_emicapregi/exog/not_used.txt
+++ b/modules/41_emicapregi/exog/not_used.txt
@@ -16,5 +16,5 @@ cm_emiscen, switch, ???
 pm_shPPPMER,input,questionnair
 pm_gdp,input,questionnaire
 cm_permittradescen,input,questionnaire
-cm_pemittradefinalyr, input, ???
-cm_pemittraderatio, input, ???
+cm_permitTradeFinalYr, input, ???
+cm_permitTradeRatio, input, ???
diff --git a/modules/41_emicapregi/none/not_used.txt b/modules/41_emicapregi/none/not_used.txt
index 55be269068..2ae02ab04f 100644
--- a/modules/41_emicapregi/none/not_used.txt
+++ b/modules/41_emicapregi/none/not_used.txt
@@ -14,5 +14,5 @@ cm_emiscen, switch, ???
 pm_shPPPMER,input,questionnaire
 pm_gdp,input,questionnaire
 cm_permittradescen,input,questionnaire
-cm_pemittradefinalyr, input, ???
-cm_pemittraderatio, input, ???
+cm_permitTradeFinalYr, input, ???
+cm_permitTradeRatio, input, ???