I just realized something, how will money work?

It will come up, should we just go with "I gave him a lot of money" or come up with a nation economy counter thingy.
Like in games, one national wealth $ is usually more of an indicator of loads of money instead of going with like "I pay 22'745 silver and 6´741 copper to the merchant family" you pay one Nation $.

I can go with any, but i still wonder.