Without trust, social life is all but impossible. We walk down the street unarmed, invest our money with strangers, and pay taxes -- all because we trust that nobody will mug us, take the cash to Cancun, or use government revenue to enrich a family company. The only other way to coordinate complex activity is coercion -- which, as the Soviets learned, is neither efficient nor pleasant. Today, when your credit-card number makes regular trips to Bangalore and Ghana, start-ups… more