According to the Economist, the "de facto dollar zone" -- comprising America and all those countries whose currencies move in sync with the dollar -- accounts for about: 10% of the world's population 40% of the world's population 60% of the world's population 80% of the world's population Since Trump's election, the Chinese currency has: fallen in value surged in value moved in sync with die dollar remained fairly stable The country whose stock markets have performed the best so far in 2016 is: Britain Germany France Spain Key tax reform concepts being considered by the Republicans now include all of the following except