Imagine, for a second, how finance began, with small loans within families and between trusted friends. As the circle of lenders and borrowers grew, financial transactions were able to muster larger sums and to spread risk, even as promises became harder to enforce. Paul Seabright, an economist at the University of Toulouse in France, observes that trust in a modern economy has evolved to the miraculous point where people give complete strangers sums of money they would not dream of entrusting to their next-door neighbours. From that a further miracle follows, for trust is what raises the billions of dollars that fund modern industry. - Kyle Outlaw