But, again, this is only the thin end of the wedge. One of the bedrocks of global prosperity over the past few decades has been the liberation of capital markets, the fact that money has been able to move freely around the world. While it is something few are currently contemplating, it is no longer improbable that some might impose controls on the amount of cash moving in and out of their countries. Is it so crazy to contemplate the US falling victim to such a temptation if China starts dumping its billions of dollars' worth of American investments?