Money: a constructivist approach

When I was younger, I thought that money was cash. In this view, if you went to a bank and deposited a dollar, at the end of the day, the dollar would be placed neatly next to a stack of gold bricks, in a vault deep beneath the bank. If you sent a wire, the dollar (or another like it) would be aboard an armored car the next day to the receiving bank. An armored plane if you paid for same day. Of…