What exactly is money, where does it come from, and can it run out?

Whether we like it or not, our world revolves around money, yet we rarely stop to think about it. What exactly is money, where does it come from, and can it run out? What is this force that drives trade, ignites revolutions, fuels discoveries and inspires art, philosophy, and science? We discuss all with David Mc Williams, Economist ,and author of “Money The Story of Humanity”.