Index: binaries/data/mods/public/gui/session/selection_details.js
===================================================================
--- binaries/data/mods/public/gui/session/selection_details.js
+++ binaries/data/mods/public/gui/session/selection_details.js
@@ -533,12 +533,12 @@
 		{ "gain": gain.market2Gain, "owner": gain.market2Owner }
 	];
 
-	let primaryGain = gain.traderGain;
+	let primaryGain = Math.ceil(gain.traderGain/10);
 
 	for (let market of markets)
 		if (market.gain && market.owner == gain.traderOwner)
 			// Translation: Used in the trading gain tooltip to concatenate profits of different players
-			primaryGain += translate("+") + market.gain;
+			primaryGain += translate("+") + Math.ceil(market.gain/10);
 
 	let tooltip = tradingGainString(primaryGain, gain.traderOwner);
 
@@ -546,7 +546,7 @@
 		if (market.gain && market.owner != gain.traderOwner)
 			tooltip +=
 				translateWithContext("Separation mark in an enumeration", ", ") +
-				tradingGainString(market.gain, market.owner);
+				tradingGainString(Math.ceil(market.gain/10), market.owner);
 
 	return tooltip;
 }
Index: binaries/data/mods/public/simulation/helpers/TraderGain.js
===================================================================
--- binaries/data/mods/public/simulation/helpers/TraderGain.js
+++ binaries/data/mods/public/simulation/helpers/TraderGain.js
@@ -22,9 +22,11 @@
 	if (trader)
 	{
 		let cmpTrader = Engine.QueryInterface(trader, IID_Trader);
+		//gainMultiplier is normalized a 100m distance on a 1024 map
 		if (!cmpTrader)
 			return null;
-		gainMultiplier = cmpTrader.GetTraderGainMultiplier();
+		let normalization = 1024 / 10000;
+		gainMultiplier = cmpTrader.GetTraderGainMultiplier() * normalization;
 	}
 	else	//called from the gui, modifications already applied
 	{
@@ -37,10 +39,11 @@
 
 	// Calculate ordinary Euclidean distance between markets.
 	// We don't use pathfinder, because ordinary distance looks more fair.
-	let distanceSq = firstMarketPosition.distanceToSquared(secondMarketPosition);
-	// We calculate gain as square of distance to encourage trading between remote markets
-	// and gainMultiplier corresponds to the gain for a 100m distance
-	gain.traderGain = gainMultiplier * distanceSq / 10000;
+	let distance = firstMarketPosition.distanceTo(secondMarketPosition);
+	let cmpTerrain = Engine.QueryInterface(SYSTEM_ENTITY, IID_Terrain);
+	// We calculate gain as distance between markets
+	// and 
+	gain.traderGain = gainMultiplier * Math.sqrt( 1024/ cmpTerrain.GetMapSize() ) * cmpTerrain.GetMapSize() * Math.tanh(distance / cmpTerrain.GetMapSize());
 
 	gain.market1Owner = cmpMarket1Player.GetPlayerID();
 	gain.market2Owner = cmpMarket2Player.GetPlayerID();