Current plan is to allow a free trade economy. You can hop onto any other players realm and trade. Our trading screen is very similar to what you see in D2.
I’ll let Kevin Jordan answer economy questions, he’s our master of coin 
Btw, one cool idea that I wanna get in is that you’d be able to create ‘displays’ and fill them with your wares to allow for async trading. Imagine buying a house that you turn into your own armory where you set up a bunch of dolls and dress them up with armor you found and you can set a price for each item.
If another player interacts with those displays, they just get a vendor window and can buy your stuff even while you’re away.