Go back a few thousand years and commerce as we know it didn't exist. My point still stands. If you want to generalize over all human systems of exchange, then

Go back a few thousand years and commerce as we know it didn't exist. My point still stands. If you want to generalize over all human systems of exchange, then be my guest, make a TED Talk and I can't wait to watch it. And my point about kings also still stands. Yes, there was once a world without them. In these worlds, everyone had to do everything. Do you really want to be your own soldier, builder and priest?