Sebastian Mallaby, in the Washington Post, argues that it is important not to misidentify or oversimplify the causes of the credit crisis.

The real roots of the crisis lie in a flawed response to China. Starting in the 1990s, the flood of cheap products from China kept global inflation low, allowing central banks to operate relatively loose monetary policies. But the flip side of China’s export surplus was that China had a capital surplus, too. Chinese savings sloshed into asset markets ’round the world, driving up the price of everything from Florida condos to Latin American stocks.

That gave central bankers a choice: Should they carry on targeting regular consumer inflation, which Chinese exports had pushed down, or should they restrain asset inflation, which Chinese savings had pushed upward? Alan Greenspan’s Fed chose to stand aside as asset prices rose; it preferred to deal with bubbles after they popped by cutting interest rates rather than by preventing those bubbles from inflating. After the dot-com bubble, this clean-up-later policy worked fine. With the real estate bubble, it has proved disastrous.

So the first cause of the crisis lies with the Fed, not with deregulation. If too much money was lent and borrowed, it was because Chinese savings made capital cheap and the Fed was not aggressive enough in hiking interest rates to counteract that. Moreover, the Fed’s track record of cutting interest rates to clear up previous bubbles had created a seductive one-way bet. Financial engineers built huge mountains of debt partly because they expected to profit in good times — and then be rescued by the Fed when they got into trouble.

Of course, the financiers did create those piles of debt, and they certainly deserve some blame for today’s crisis. But was the financiers’ miscalculation caused by deregulation? Not really.

The key financiers in this game were not the mortgage lenders, the ratings agencies or the investment banks that created those now infamous mortgage securities. In different ways, these players were all peddling financial snake oil, but as Columbia University’s Charles Calomiris observes, there will always be snake-oil salesmen. Rather, the key financiers were the ones who bought the toxic mortgage products. If they hadn’t been willing to buy snake oil, nobody would have been peddling it.

Who were the purchasers? They were by no means unregulated. U.S. investment banks, regulated by the Securities and Exchange Commission, bought piles of toxic waste. U.S. commercial banks, regulated by several agencies, including the Fed, also devoured large quantities. European banks, which faced a different and supposedly more up-to-date supervisory scheme, turn out to have been just as rash. By contrast, lightly regulated hedge funds resisted buying toxic waste for the most part — though they are now vulnerable to the broader credit crunch because they operate with borrowed money.

If that doesn’t convince you that deregulation is the wrong scapegoat, consider this: The appetite for toxic mortgages was fueled by Fannie Mae and Freddie Mac, the super-regulated housing finance companies. Calomiris calculates that Fannie and Freddie bought more than a third of the $3 trillion in junk mortgages created during the bubble and that they did so because heavy government oversight obliged them to push money toward marginal home purchasers. There’s a vigorous argument about whether Calomiris’s number is too high. But everyone concedes that Fannie and Freddie poured fuel on the fire to the tune of hundreds of billions of dollars.

So blaming deregulation for the financial mess is misguided. But it is dangerous, too, because one of the big challenges for the next president will be to defend markets against the inevitable backlash that follows this crisis.

Read the whole thing.