diff --git a/core/src/com/unciv/logic/civilization/TechManager.kt b/core/src/com/unciv/logic/civilization/TechManager.kt
index 62dcad9f77..bad62edbb3 100644
--- a/core/src/com/unciv/logic/civilization/TechManager.kt
+++ b/core/src/com/unciv/logic/civilization/TechManager.kt
@@ -44,6 +44,7 @@ class TechManager {
         var techCost = GameBasics.Technologies[techName]!!.cost.toFloat()
         techCost *= civInfo.getDifficulty().researchCostModifier
         techCost *= civInfo.gameInfo.gameParameters.gameSpeed.getModifier()
+        techCost *= (1 + 0.02 * (civInfo.cities.size -1 )).toFloat()
         return techCost.toInt()
     }