Production Efficiency modifiers have been reduced at various places, as the cap of +200 was reached easily, making economic techs and investments useless from the mid game.
Why is PE capped at 200? Surely such limitations would become irrelevant in late-game as early industrial revolution begins in earnest around 1750 in some countries. I think this cap should be made so that it becomes obsolete by that date or something, maybe depending on some late-game factors.