“Paper money, backed by the authority of the state, was an astonishing innovation, one that reshaped the world. That’s hard to remember: we grow used to the ways we pay our bills and are paid for our work, to the dance of numbers in our bank balances and credit-card statements. It’s only at moments when the system buckles that we start to wonder why these things are worth what they seem to be worth.” – The New Yorker