The universe has a couple of laws that it’s really fond of. They apply to everything and they never get broken. The Law of Gravity is one. But my favorite is the Law of Unintended Consequences. It applies to almost everything, and its power of enforcement is unrivaled. This is the law that says that you can’t anticipate what will happen when you mess with a complex system. If you’ve been reading anything at all about the global economy in the past 10 years, you know that the story about China preparing to knock the U.S. from its pedestal...