Buildings should feed each other before going on the market

[julietjarek]

Instead of certain buildings synergizing with one another; all of the resources you produce go on the market where you have to buy back the resources to support your other buildings.

Say for example you have a Fishing Village which requires tools and salt; if you build a Salt Collector, the salt is first sold on the market and then re-purchased from the market to supply the other buildings.

There should be a mechanic where a province uses its local resources first to fuel it's other operations instead of selling and re-buying.