FOR decades now, as a writer, economist and scold, I have been receiving letters from thoughtful readers. Many of them have warned me about the dangers of a secret government running the world, organized by the Trilateral Commission, or the Ford Foundation, or the Big Oil companies or, of course, world Jewry. I always scoff at these letters. The world is far too complex a place to be run by any one group. But the closest I have recently seen to such a world-running body would have to be a certain large investment bank, whose alums are routinely Treasury secretaries,...