Could citizens in neighbouring countries attempt to join your civ and vice-versa and join the populations. I feel an economy needs to play a bigger role in the game. Someone mentioned tourism i think thats a great idea with wealth moving from country to country. I would also like it if we could take out loans from a world bank not just other civs and use cities, factories etc as collateral. I like the idea of building an aqueduct for an opponent with them paying you to do it. This would be like exporting or importing goods with your workers producing something for export? Would this be too difficult to introduce?