diff -Nur -Xfreecivdiff.ignore freeciv-cvs/common/city.c freeciv-patched/common/city.c
--- freeciv-cvs/common/city.c	2003-07-24 17:00:39.000000000 +0100
+++ freeciv-patched/common/city.c	2003-07-24 17:00:57.000000000 +0100
@@ -1776,6 +1776,7 @@
       forcecontent = 0, forcehappy = 0;
   int makecontentpct = 100, forcecontentpct = 100;
   int makecontentmil = 0, makecontentmilper = 0;
+  int corruptadj = 0, corruptpct = 100;
 
   enum tile_special_type spec = map_get_special(pcity->x, pcity->y);
   enum tile_terrain_type terr = map_get_terrain(pcity->x, pcity->y);
@@ -1869,6 +1870,10 @@
         forcecontentpct = forcecontentpct * amount / 100; break;
       case EFT_FORCE_HAPPY:
         forcehappy += amount; break;
+      case EFT_CORRUPT_ADJ:
+	corruptadj += amount; break;
+      case EFT_CORRUPT_PCT:
+	corruptpct = corruptpct * amount / 100; break;
       case EFT_AIRLIFT:
         pcity->airlift = TRUE; break;
       default:
@@ -1877,6 +1882,9 @@
     }
   } city_effects_iterate_end;
 
+  pcity->corruptadj = corruptadj;
+  pcity->corruptpct = corruptpct;
+
   /* Apply the multipliers to the bonuses (such that the bonuses are all
      summed first, and only then are the multipliers applied) */
   tax_bonus = tax_bonus * tax_pct / 100;
@@ -2363,7 +2371,7 @@
   struct government *g = get_gov_pcity(pcity);
   struct city *capital;
   int dist;
-  int val, trade_penalty;
+  int val, trade_penalty,  corruptadj;
 
   assert(game.notradesize < game.fulltradesize);
   if (pcity->size <= game.notradesize) {
@@ -2393,8 +2401,10 @@
       dist * g->corruption_distance_factor + g->extra_corruption_distance;
   val = trade * dist / g->corruption_modifier;
 
-  if (city_got_building(pcity, B_COURTHOUSE) ||
-      city_got_building(pcity, B_PALACE)) val /= 2;
+  /* Add modifiers from generalised improvements */
+  corruptadj = pcity->corruptadj * pcity->corruptpct / 100;
+  val = val * corruptadj / 100;
+
   val *= g->corruption_level;
   val /= 100;
   val = CLIP(trade_penalty, val, trade);
diff -Nur -Xfreecivdiff.ignore freeciv-cvs/common/city.h freeciv-patched/common/city.h
--- freeciv-cvs/common/city.h	2003-07-24 17:00:25.000000000 +0100
+++ freeciv-patched/common/city.h	2003-07-24 17:00:57.000000000 +0100
@@ -244,6 +244,9 @@
   struct tile_mod tile_add[CITY_MAP_SIZE][CITY_MAP_SIZE];
   struct tile_mod tile_pct[CITY_MAP_SIZE][CITY_MAP_SIZE];
 
+  /* corruption modifiers from city improvements */
+  int corruptadj, corruptpct;
+
   /* happiness modifiers from city improvements */
   int makecontent, makehappy, forcecontent, forcehappy;
   int makecontentmil, makecontentmilper;