--- a/src/openttd.h	Sat Mar 31 12:34:36 2007 +0000
+++ b/src/openttd.h	Sat Mar 31 13:19:30 2007 +0000
@@ -191,7 +191,7 @@
 	NUM_LANDSCAPE = 4,
 };
 
-#define GAME_DIFFICULTY_NUM 19
+#define GAME_DIFFICULTY_NUM 20
 
 struct GameDifficulty {
 	int max_no_competitors;
@@ -213,6 +213,7 @@
 	int disasters;
 	int town_council_tolerance; // minimum required town ratings to be allowed to demolish stuff
 	int economic_growth;
+	int economic_model;
 };
 
 enum {