By the end of September, Paulson was asking Congress for $700 billion in funds he claimed would be used to buy mortgage relates assets from U.S. financial institutions. Less than two weeks after Congress gave Paulson his money, the Treasury secretary switched course and used the funds to buy equity shares in banks. Many of the banks did not need or even want Paulson’s money, but Paulson forced them to take it, hoping to set the stage for a massive consolidation of the banking sector.

Then just last week, Paulson shifted gears again. Now he is “exploring strategies” to purchase stock in non-bank financial firms, purchase consumer credit securities, and subsidize mortgage foreclosure mitigation efforts. There are specific problems with each of these policy proposals, but Paulson’s announcement last week crystallized a much larger problem: Instead of being a source of market stability, Paulson has become perhaps the single most disruptive force in the global economy.

When no one knows how the rules of the game are going to change — and they seem to change from week to week — who wants to take a risk? Who wants to borrow money? Who wants to invest? Business and consumers are hunkering down, waiting for the storm of change to pass.

The problem isn’t liquidity. It’s uncertainty. Paulson doesn’t realize that his erratic attempts at creating liquidity are creating the uncertainty that makes liquidity meaningless. …

The great economist F.A. Hayek wrote that “the curious task of economics is to demonstrate to men how little they really know about what they imagine they can design.”

With each improvisation, Secretary Paulson is proving how little he knows about what he imagines he can design.