diff --git a/src/ac/ed/lurg/country/GlobalPrice.java b/src/ac/ed/lurg/country/GlobalPrice.java
index fa0fc1a30e29ee299c6dd9f18cbcff2fe6cd5d0b..f0c96121617b623e98844e35b52f987b8c294014 100644
--- a/src/ac/ed/lurg/country/GlobalPrice.java
+++ b/src/ac/ed/lurg/country/GlobalPrice.java
@@ -68,16 +68,16 @@ public class GlobalPrice implements Serializable {
 		return transportLosses;
 	}
 
-	public GlobalPrice createWithUpdatedMarketPrices(double newImports, double newExportAmountBeforeLoss, Timestep timestep, double production) {
+	public GlobalPrice createWithUpdatedMarketPrices(double newImports, double newExportAmountBeforeLoss, Timestep thisTimeStep, double production) {
 
 		if (newImports > 0 || newExportAmountBeforeLoss > 0) {
-			double oldDiff = !timestep.equals(timestep) ? 0.0 : exportAmountBeforeLoss - transportLosses - importAmount; // if recomputing for same year need to back our previous adjustment
-			double transportLossRate = ModelConfig.updateParameterForShocks(timestep.getYear(), "TRANSPORT_LOSSES");
+			double oldDiff = timestep.equals(thisTimeStep) ? exportAmountBeforeLoss - transportLosses - importAmount : 0.0; // if recomputing for same year need to back our previous adjustment
+			double transportLossRate = ModelConfig.updateParameterForShocks(thisTimeStep.getYear(), "TRANSPORT_LOSSES");
 			double newTransportLosses = newExportAmountBeforeLoss * transportLossRate;
 			double stockChange = newExportAmountBeforeLoss - newTransportLosses - newImports - oldDiff;
 			
 			double updatedStock;
-			if (ModelConfig.IS_CALIBRATION_RUN  && timestep.getTimestep() <= ModelConfig.END_FIRST_STAGE_CALIBRATION)
+			if (ModelConfig.IS_CALIBRATION_RUN  && thisTimeStep.getTimestep() <= ModelConfig.END_FIRST_STAGE_CALIBRATION)
 				updatedStock = stockLevel;  // don't update stock in inital stage of calibration
 			else
 				updatedStock = stockLevel + stockChange;
@@ -87,7 +87,7 @@ public class GlobalPrice implements Serializable {
 			
 			double adjustment;
 
-			if (!ModelConfig.MARKET_ADJ_PRICE || (ModelConfig.IS_CALIBRATION_RUN && timestep.getTimestep() <= ModelConfig.END_FIRST_STAGE_CALIBRATION)) {
+			if (!ModelConfig.MARKET_ADJ_PRICE || (ModelConfig.IS_CALIBRATION_RUN && thisTimeStep.getTimestep() <= ModelConfig.END_FIRST_STAGE_CALIBRATION)) {
 				adjustment = 1;
 			}
 			else if (ModelConfig.PRICE_UPDATE_BY_MARKET_IMBALANCE) {
@@ -117,7 +117,7 @@ public class GlobalPrice implements Serializable {
 			double newPrice = exportPrice * adjustment;
 			double refPrice = ModelConfig.IS_CALIBRATION_RUN ? exportPrice : referencePrice;  // during calibration reference price isn't fixed, but it is after that
 			
-			return new GlobalPrice(timestep, newPrice, updatedStock, newImports, newExportAmountBeforeLoss, newTransportLosses, refPrice);			
+			return new GlobalPrice(thisTimeStep, newPrice, updatedStock, newImports, newExportAmountBeforeLoss, newTransportLosses, refPrice);			
 		}
 		else {
 			LogWriter.printlnError(String.format("Price for not updated (still %s), as no imports and no exports for it", exportPrice));