diff --git a/source/glest_game/type_instances/faction.cpp b/source/glest_game/type_instances/faction.cpp
index e12c60045..d0dcaafaa 100644
--- a/source/glest_game/type_instances/faction.cpp
+++ b/source/glest_game/type_instances/faction.cpp
@@ -1122,6 +1122,18 @@ namespace Glest {
 				}
 			}
 
+			//required resources
+			for (int i = 0; i < rt->getCostCount(); i++) {
+				const ResourceType *resource = rt->getCost(i)->getType();
+				int cost = rt->getCost(i)->getAmount();
+				if (cost > 0) {
+					int available = getResource(resource)->getAmount();
+					if (cost > available) {
+						return false;
+					}
+				}
+			}
+
 			if (dynamic_cast <const UnitType *>(rt) != NULL) {
 				const UnitType *producedUnitType =
 					dynamic_cast <const UnitType *>(rt);
diff --git a/source/glest_game/types/element_type.cpp b/source/glest_game/types/element_type.cpp
index 37a358a0c..b6c48dfc5 100644
--- a/source/glest_game/types/element_type.cpp
+++ b/source/glest_game/types/element_type.cpp
@@ -56,38 +56,74 @@ namespace Glest {
 		// =====================================================
 
 		string RequirableType::getReqDesc(bool translatedValue) const {
-			bool anyReqs = false;
+			return getReqDesc(false, translatedValue);
+		}
 
-			string reqString = "";
-			for (int i = 0; i < getUnitReqCount(); ++i) {
-				if (getUnitReq(i) == NULL) {
-					throw megaglest_runtime_error("getUnitReq(i) == NULL");
+		const Resource *RequirableType::getCost(const ResourceType * rt) const {
+			for (int i = 0; i < (int) costs.size(); ++i) {
+				if (costs[i].getType() == rt) {
+					return &costs[i];
+				}
+			}
+			return NULL;
+		}
+
+
+		string RequirableType::getResourceReqDesc(bool lineBreaks,
+			bool translatedValue) const {
+			string str = "";
+			for (int i = 0; i < getCostCount(); ++i) {
+				if (getCost(i)->getAmount() != 0) {
+					str += getCost(i)->getType()->getName(translatedValue);
+					str += ": " + intToStr(getCost(i)->getAmount());
+					if (lineBreaks == true) {
+						str += "\n";
+					} else {
+						str += " ";
+					}
+				}
+			}
+
+			return str;
+		}
+
+		string RequirableType::getUnitAndUpgradeReqDesc(bool lineBreaks,
+			bool translatedValue)
+			const {
+			string str = "";
+			for (int i = 0; i < getUnitReqCount(); ++i) {
+				str += getUnitReq(i)->getName(translatedValue);
+				if (lineBreaks == true) {
+					str += "\n";
+				} else {
+					str += " ";
 				}
-				reqString += getUnitReq(i)->getName(translatedValue);
-				reqString += "\n";
-				anyReqs = true;
 			}
 
 			for (int i = 0; i < getUpgradeReqCount(); ++i) {
-				if (getUpgradeReq(i) == NULL) {
-					throw megaglest_runtime_error("getUpgradeReq(i) == NULL");
+				str += getUpgradeReq(i)->getName(translatedValue);
+				if (lineBreaks == true) {
+					str += "\n";
+				} else {
+					str += " ";
 				}
-
-				reqString += getUpgradeReq(i)->getName(translatedValue);
-				reqString += "\n";
-				anyReqs = true;
 			}
 
-			string str = getName(translatedValue);
-			if (anyReqs) {
-				return str + " " + Lang::getInstance().getString("Reqs",
-					(translatedValue ==
-						true ? "" :
-						"english")) +
-					":\n" + reqString;
-			} else {
-				return str;
+			return str;
+		}
+
+		string RequirableType::getReqDesc(bool ignoreResourceRequirements, bool translatedValue) const {
+			string str =
+				getName(translatedValue) + " " +
+				Lang::getInstance().getString("Reqs",
+				(translatedValue ==
+					true ? "" : "english")) + ":\n";
+			if (ignoreResourceRequirements == false) {
+				str += getResourceReqDesc(true, translatedValue);
 			}
+
+			str += getUnitAndUpgradeReqDesc(true, translatedValue);
+			return str;
 		}
 
 		//void RequirableType::saveGame(XmlNode *rootNode) const {
@@ -124,77 +160,6 @@ namespace Glest {
 		ProducibleType::~ProducibleType() {
 		}
 
-		const Resource *ProducibleType::getCost(const ResourceType * rt) const {
-			for (int i = 0; i < (int) costs.size(); ++i) {
-				if (costs[i].getType() == rt) {
-					return &costs[i];
-				}
-			}
-			return NULL;
-		}
-
-		string ProducibleType::getReqDesc(bool translatedValue) const {
-			return getReqDesc(false, translatedValue);
-		}
-
-		string ProducibleType::getResourceReqDesc(bool lineBreaks,
-			bool translatedValue) const {
-			string str = "";
-			for (int i = 0; i < getCostCount(); ++i) {
-				if (getCost(i)->getAmount() != 0) {
-					str += getCost(i)->getType()->getName(translatedValue);
-					str += ": " + intToStr(getCost(i)->getAmount());
-					if (lineBreaks == true) {
-						str += "\n";
-					} else {
-						str += " ";
-					}
-				}
-			}
-
-			return str;
-		}
-
-		string ProducibleType::getUnitAndUpgradeReqDesc(bool lineBreaks,
-			bool translatedValue)
-			const {
-			string str = "";
-			for (int i = 0; i < getUnitReqCount(); ++i) {
-				str += getUnitReq(i)->getName(translatedValue);
-				if (lineBreaks == true) {
-					str += "\n";
-				} else {
-					str += " ";
-				}
-			}
-
-			for (int i = 0; i < getUpgradeReqCount(); ++i) {
-				str += getUpgradeReq(i)->getName(translatedValue);
-				if (lineBreaks == true) {
-					str += "\n";
-				} else {
-					str += " ";
-				}
-			}
-
-			return str;
-		}
-
-		string ProducibleType::getReqDesc(bool ignoreResourceRequirements,
-			bool translatedValue) const {
-			string str =
-				getName(translatedValue) + " " +
-				Lang::getInstance().getString("Reqs",
-				(translatedValue ==
-					true ? "" : "english")) + ":\n";
-			if (ignoreResourceRequirements == false) {
-				str += getResourceReqDesc(true, translatedValue);
-			}
-
-			str += getUnitAndUpgradeReqDesc(true, translatedValue);
-			return str;
-		}
-
 		//void ProducibleType::saveGame(XmlNode *rootNode) const {
 		//      RequirableType::saveGame(rootNode);
 		//
diff --git a/source/glest_game/types/element_type.h b/source/glest_game/types/element_type.h
index f0b80b8d0..33716f05f 100644
--- a/source/glest_game/types/element_type.h
+++ b/source/glest_game/types/element_type.h
@@ -74,10 +74,12 @@ namespace Glest {
 		private:
 			typedef vector < const UnitType *>UnitReqs;
 			typedef vector < const UpgradeType *>UpgradeReqs;
+			typedef vector < Resource > Costs;
 
 		protected:
 			UnitReqs unitReqs;        //needed units
 			UpgradeReqs upgradeReqs;  //needed upgrades
+			Costs costs;              //needed costs
 
 		public:
 			//get
@@ -93,10 +95,24 @@ namespace Glest {
 			const UnitType *getUnitReq(int i) const {
 				return unitReqs[i];
 			}
+			//get
+			int getCostCount() const {
+				return (int) costs.size();
+			}
+			const Resource *getCost(int i) const {
+				return &costs[i];
+			}
+			const Resource *getCost(const ResourceType * rt) const;
 
 			//other
 			virtual string getReqDesc(bool translatedValue) const;
 
+			string getResourceReqDesc(bool lineBreaks, bool translatedValue) const;
+			string getUnitAndUpgradeReqDesc(bool lineBreaks,
+				bool translatedValue) const;
+			string getReqDesc(bool ignoreResourceRequirements,
+				bool translatedValue) const;
+
 			//virtual void saveGame(XmlNode *rootNode) const;
 		};
 
@@ -108,11 +124,7 @@ namespace Glest {
 		// =====================================================
 
 		class ProducibleType :public RequirableType {
-		private:
-			typedef vector < Resource > Costs;
-
 		protected:
-			Costs costs;
 			Texture2D *cancelImage;
 			int productionTime;
 
@@ -120,14 +132,6 @@ namespace Glest {
 			ProducibleType();
 			virtual ~ProducibleType();
 
-			//get
-			int getCostCount() const {
-				return (int) costs.size();
-			}
-			const Resource *getCost(int i) const {
-				return &costs[i];
-			}
-			const Resource *getCost(const ResourceType * rt) const;
 			int getProductionTime() const {
 				return productionTime;
 			}
@@ -135,16 +139,6 @@ namespace Glest {
 				return cancelImage;
 			}
 
-			//varios
-			void checkCostStrings(TechTree * techTree);
-
-			virtual string getReqDesc(bool translatedValue) const;
-			string getResourceReqDesc(bool lineBreaks, bool translatedValue) const;
-			string getUnitAndUpgradeReqDesc(bool lineBreaks,
-				bool translatedValue) const;
-			string getReqDesc(bool ignoreResourceRequirements,
-				bool translatedValue) const;
-
 			//      virtual void saveGame(XmlNode *rootNode) const;
 			//      void loadGame(const XmlNode *rootNode);
 		};