diff -Nur freeciv-dev_trunk/common/game.c freeciv-dev_mainbranch/common/game.c
--- freeciv-dev_trunk/common/game.c	Sun Sep  2 23:42:26 2001
+++ freeciv-dev_mainbranch/common/game.c	Sat Sep  8 15:57:05 2001
@@ -710,6 +710,7 @@
   game.fogofwar    = GAME_DEFAULT_FOGOFWAR;
   game.fogofwar_old= game.fogofwar;
   game.auto_ai_toggle = GAME_DEFAULT_AUTO_AI_TOGGLE;
+  game.corruptionsize = GAME_DEFAULT_CORRUPTIONSIZE;
   game.barbarianrate  = GAME_DEFAULT_BARBARIANRATE;
   game.onsetbarbarian = GAME_DEFAULT_ONSETBARBARIAN;
   game.nbarbarians = 0;
diff -Nur freeciv-dev_trunk/common/game.h freeciv-dev_mainbranch/common/game.h
--- freeciv-dev_trunk/common/game.h	Thu Sep  6 22:23:54 2001
+++ freeciv-dev_mainbranch/common/game.h	Sat Sep  8 15:57:05 2001
@@ -73,6 +73,7 @@
   int diplchance;
   int cityfactor;
   int civilwarsize;
+  int corruptionsize;
   int min_players, max_players, nplayers;
   int aifill;
   int barbarianrate;
@@ -371,6 +372,10 @@
 #define GAME_DEFAULT_PINGTIMEOUT     60
 #define GAME_MIN_PINGTIMEOUT         60
 #define GAME_MAX_PINGTIMEOUT         1800
+
+#define GAME_DEFAULT_CORRUPTIONSIZE  1
+#define GAME_MIN_CORRUPTIONSIZE      1
+#define GAME_MAX_CORRUPTIONSIZE      150
 
 #define GAME_DEFAULT_BARBARIANRATE   2
 #define GAME_MIN_BARBARIANRATE       0
diff -Nur freeciv-dev_trunk/common/city.c freeciv-dev_mainbranch/common/city.c
--- freeciv-dev_trunk/common/city.c	Thu Sep  6 19:31:27 2001
+++ freeciv-dev_mainbranch/common/city.c	Sat Sep  8 15:57:05 2001
@@ -1838,6 +1838,9 @@
       city_got_building(pcity, B_PALACE)) val /= 2;
   val *= g->corruption_level;
   val /= 100;
+
+  /* corruption penalty if city is smaller than corruptionsize */
+  val = MAX(val, trade * (game.corruptionsize - pcity->size) * 3 / 2 / game.corruptionsize);
   if (val > trade)
     val = trade;
   return (val);			/* how did y'all let me forget this one? -- Syela */
diff -Nur freeciv-dev_trunk/server/savegame.c freeciv-dev_mainbranch/server/savegame.c
--- freeciv-dev_trunk/server/savegame.c	Sun Sep  2 23:42:27 2001
+++ freeciv-dev_mainbranch/server/savegame.c	Sat Sep  8 15:57:05 2001
@@ -1991,6 +1991,7 @@
     game.warminglevel  = secfile_lookup_int(file, "game.warminglevel");
     game.nuclearwinter = secfile_lookup_int_default(file, 0, "game.nuclearwinter");
     game.coolinglevel  = secfile_lookup_int_default(file, 8, "game.coolinglevel");
+    game.corruptionsize= secfile_lookup_int_default(file, 1, "game.corruptionsize");
     game.unhappysize   = secfile_lookup_int(file, "game.unhappysize");
 
     if (game.version >= 10100) {
@@ -2352,6 +2353,7 @@
   secfile_insert_int(file, game.warminglevel, "game.warminglevel");
   secfile_insert_int(file, game.nuclearwinter, "game.nuclearwinter");
   secfile_insert_int(file, game.coolinglevel, "game.coolinglevel");
+  secfile_insert_int(file, game.corruptionsize, "game.corruptionsize");
   secfile_insert_int(file, game.unhappysize, "game.unhappysize");
   secfile_insert_int(file, game.cityfactor, "game.cityfactor");
   secfile_insert_int(file, game.civilwarsize, "game.civilwarsize");
diff -Nur freeciv-dev_trunk/server/stdinhand.c freeciv-dev_mainbranch/server/stdinhand.c
--- freeciv-dev_trunk/server/stdinhand.c	Fri Sep  7 09:57:12 2001
+++ freeciv-dev_mainbranch/server/stdinhand.c	Sat Sep  8 15:57:05 2001
@@ -489,7 +489,16 @@
     N_("If a city would expand, but it can't because it needs an Aqueduct "
        "(or Sewer System), it loses this percentage of its foodbox "
        "(or half that amount if it has a Granary).") },
-  
+
+  { "corruptsize", &game.corruptionsize, NULL, NULL,
+    SSET_RULES, SSET_TO_CLIENT,
+    GAME_MIN_CORRUPTIONSIZE, GAME_MAX_CORRUPTIONSIZE, GAME_DEFAULT_CORRUPTIONSIZE,
+    N_("Minimum city size without fixed corruption"),
+    N_("There is a minimum corruption in all cities smaller than this.  "
+       "The minimum is 100% for sizes up to corruptsize/3, and decreases "
+       "gradually to 0% for size=corruptsize.  This does not apply under "
+       "Democracy.") },
+
   { "unhappysize", &game.unhappysize, NULL, NULL,
     SSET_RULES, SSET_TO_CLIENT,
     GAME_MIN_UNHAPPYSIZE, GAME_MAX_UNHAPPYSIZE, GAME_DEFAULT_UNHAPPYSIZE,