What Is a Merchant?

A lot of the complexity that's there is not, a lot of markets have intrinsic complexity. You can't fix it with an interface. If you try to oversimplify it, then you're just going to be obscuring important complexity and will screw you up. So you either have to fix that complexity or you have to make it simpler. Or you have to figure out a better way to instantiate that complexity to people.