Why does pottery cost 40 instead of 38?

[razor436]

Why do tech costs in the in-game tech tree differ from the actual tech costs of the game.

For example, on a standard map: Pottery should costs 38, according in-game technology tree.
But when I mouse over the tech progress overlay at the top left of the game screen it clearly says 40.

To avoid any confusion, I think they should be equal.

 

[crusader01]

Each city you found increase your tech cost depend on map size and speed.
When i play huge marathon, each city founded increase 2% tech cost.

 

[Vidszhite]

Why do tech costs in the in-game tech tree differ from the actual tech costs of the game.

For example, on a standard map: Pottery should costs 38, according in-game technology tree.
But when I mouse over the tech progress overlay at the top left of the game screen it clearly says 40.

To avoid any confusion, I think they should be equal.

5% tech penalty. Your capital counts. I'm sure it's base 38 because it will increase to a nice round 40 once you found your capital.

 

[joncnunn]

In addition to the city effect; the world size map is also a factor.
"Small" is actually 100%. Standard size is 110%. Large & Huge have higher base science rates. But as above, on those maps, the per city penalty is less.

 

[Gort]

Each city you found increase your tech cost depend on map size and speed.
When i play huge marathon, each city founded increase 2% tech cost.

I think it's just map-size, actually.

 

[joncnunn]

I think it's just map-size, actually.

With BNW, hover over the science beaker; and you'll see the per city penalty for the map size you are playing on.

 

[RonMar]

Another modifier to tech cost is how many other civs in the game have already researched the tech. The cost is less.