diff --git a/src/game/engine/scenes/tests/turn_processor.gd b/src/game/engine/scenes/tests/turn_processor.gd
index 22d75ac7..b97e2593 100644
--- a/src/game/engine/scenes/tests/turn_processor.gd
+++ b/src/game/engine/scenes/tests/turn_processor.gd
@@ -239,6 +239,18 @@ func _sum_city_building_effect(city: CityScript, effect_type: String) -> int:
 	return total
 
 
+func _sum_city_building_effect_float(city: CityScript, effect_type: String) -> float:
+	var total: float = 0.0
+	for building_id: Variant in city.buildings:
+		var bdata: Dictionary = DataLoader.get_building(str(building_id))
+		if bdata.is_empty():
+			continue
+		for effect: Dictionary in bdata.get("effects", []):
+			if effect.get("type", "") == effect_type:
+				total += float(effect.get("value", 0))
+	return total
+
+
 func _apply_building_bonuses(city: CityScript, building_id: String) -> void:
 	var bdata: Dictionary = DataLoader.get_building(building_id)
 	var effects: Array = bdata.get("effects", [])
@@ -348,7 +360,12 @@ func _process_economy(player: RefCounted, game_map: RefCounted) -> void:  # Play
 		var tile_json: String = BuildableHelperScript.build_tile_yields_json(c, game_map)
 		var yields: Dictionary = c.get_yields(tile_json)
 		var building_gold: int = _sum_city_building_effect(c, "gold")
-		income += int(yields.get("gold", 0)) + building_gold
+		var city_gold: int = int(yields.get("gold", 0)) + building_gold
+		# Apply percentage bonuses (marketplace +25% = 0.25)
+		var gold_pct: float = _sum_city_building_effect_float(c, "gold_percent")
+		if gold_pct > 0.0:
+			city_gold = int(float(city_gold) * (1.0 + gold_pct))
+		income += city_gold
 	# Golden Age: +20% gold income
 	if player.golden_age_active:
 		income = int(income * 1.2)
diff --git a/src/game/engine/src/modules/management/turn_processor.gd b/src/game/engine/src/modules/management/turn_processor.gd
index 22d75ac7..b97e2593 100644
--- a/src/game/engine/src/modules/management/turn_processor.gd
+++ b/src/game/engine/src/modules/management/turn_processor.gd
@@ -239,6 +239,18 @@ func _sum_city_building_effect(city: CityScript, effect_type: String) -> int:
 	return total
 
 
+func _sum_city_building_effect_float(city: CityScript, effect_type: String) -> float:
+	var total: float = 0.0
+	for building_id: Variant in city.buildings:
+		var bdata: Dictionary = DataLoader.get_building(str(building_id))
+		if bdata.is_empty():
+			continue
+		for effect: Dictionary in bdata.get("effects", []):
+			if effect.get("type", "") == effect_type:
+				total += float(effect.get("value", 0))
+	return total
+
+
 func _apply_building_bonuses(city: CityScript, building_id: String) -> void:
 	var bdata: Dictionary = DataLoader.get_building(building_id)
 	var effects: Array = bdata.get("effects", [])
@@ -348,7 +360,12 @@ func _process_economy(player: RefCounted, game_map: RefCounted) -> void:  # Play
 		var tile_json: String = BuildableHelperScript.build_tile_yields_json(c, game_map)
 		var yields: Dictionary = c.get_yields(tile_json)
 		var building_gold: int = _sum_city_building_effect(c, "gold")
-		income += int(yields.get("gold", 0)) + building_gold
+		var city_gold: int = int(yields.get("gold", 0)) + building_gold
+		# Apply percentage bonuses (marketplace +25% = 0.25)
+		var gold_pct: float = _sum_city_building_effect_float(c, "gold_percent")
+		if gold_pct > 0.0:
+			city_gold = int(float(city_gold) * (1.0 + gold_pct))
+		income += city_gold
 	# Golden Age: +20% gold income
 	if player.golden_age_active:
 		income = int(income * 1.2)