WHAT would a Martian see when he looks at planet earth today? Over 150 countries trying to sell their goods and services to one another. Very few countries operate any more as autarkies—self-sufficient and closed economies. The fall of the Malaysian ringgit affects the stock market in Johannesburg. Response times are down to a sliver: make-or-break decisions are taps on a keyboard, zillions of dollars zip around the globe as electronic impulses.