Tradable Items

[Toltec]

What if you could set your cities to build a set of items or "cargo" depending on what resorses you have. You can then trade these with other civs or sell them at some market.

Hey what if you could have merchants that buy it!

 

[Pirate]

It's called "wealth" and it already gives you gold without all the micromanagement. What incentive would you have to buy another civ's cargo?