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Published on Friday, August 10, 2007 by The New York Times

Very Scary Things

by Paul Krugman

In September 1998, the collapse of Long Term Capital Management, a giant hedge fund, led to a meltdown in the financial markets similar, in some ways, to what's happening now. During the crisis in '98, I attended a closed-door briefing given by a senior Federal Reserve official, who laid out the grim state of the markets. "What can we do about it?" asked one participant. "Pray," replied the Fed official.

Our prayers were answered. The Fed coordinated a rescue for L.T.C.M., while Robert Rubin, the Treasury secretary at the time, and Alan Greenspan, who was the Fed chairman, assured investors that everything would be all right. And the panic subsided.

Yesterday, President Bush, showing off his M.B.A. vocabulary, similarly tried to reassure the markets. But Mr. Bush is, let's say, a bit lacking in credibility. On the other hand, it's not clear that anyone could do the trick: right now we're suffering from a serious shortage of saviors. And that's too bad, because we might need one.

What's been happening in financial markets over the past few days is something that truly scares monetary economists: liquidity has dried up. That is, markets in stuff that is normally traded all the time - in particular, financial instruments backed by home mortgages - have shut down because there are no buyers.

This could turn out to be nothing more than a brief scare. At worst, however, it could cause a chain reaction of debt defaults.

The origins of the current crunch lie in the financial follies of the last few years, which in retrospect were as irrational as the dot-com mania. The housing bubble was only part of it; across the board, people began acting as if risk had disappeared.

Everyone knows now about the explosion in subprime loans, which allowed people without the usual financial qualifications to buy houses, and the eagerness with which investors bought securities backed by these loans. But investors also snapped up high-yield corporate debt, a k a junk bonds, driving the spread between junk bond yields and U.S. Treasuries down to record lows.

Then reality hit - not all at once, but in a series of blows. First, the housing bubble popped. Then subprime melted down. Then there was a surge in investor nervousness about junk bonds: two months ago the yield on corporate bonds rated B was only 2.45 percent higher than that on government bonds; now the spread is well over 4 percent.

Investors were rattled recently when the subprime meltdown caused the collapse of two hedge funds operated by Bear Stearns, the investment bank. Since then, markets have been manic-depressive, with triple-digit gains or losses in the Dow Jones industrial average - the rule rather than the exception for the past two weeks.

But yesterday's announcement by BNP Paribas, a large French bank, that it was suspending the operations of three of its own funds was, if anything, the most ominous news yet. The suspension was necessary, the bank said, because of "the complete evaporation of liquidity in certain market segments" - that is, there are no buyers.

When liquidity dries up, as I said, it can produce a chain reaction of defaults. Financial institution A can't sell its mortgage-backed securities, so it can't raise enough cash to make the payment it owes to institution B, which then doesn't have the cash to pay institution C - and those who do have cash sit on it, because they don't trust anyone else to repay a loan, which makes things even worse.

And here's the truly scary thing about liquidity crises: it's very hard for policy makers to do anything about them.

The Fed normally responds to economic problems by cutting interest rates - and as of yesterday morning the futures markets put the probability of a rate cut by the Fed before the end of next month at almost 100 percent. It can also lend money to banks that are short of cash: yesterday the European Central Bank, the Fed's trans-Atlantic counterpart, lent banks $130 billion, saying that it would provide unlimited cash if necessary, and the Fed pumped in $24 billion.

But when liquidity dries up, the normal tools of policy lose much of their effectiveness. Reducing the cost of money doesn't do much for borrowers if nobody is willing to make loans. Ensuring that banks have plenty of cash doesn't do much if the cash stays in the banks' vaults.

There are other, more exotic things the Fed and, more important, the executive branch of the U.S. government could do to contain the crisis if the standard policies don't work. But for a variety of reasons, not least the current administration's record of incompetence, we'd really rather not go there.

Let's hope, then, that this crisis blows over as quickly as that of 1998. But I wouldn't count on it. Paul Krugman is Professor of Economics at Princeton University and a regular New York Times columnist. His most recent book is The Great Unraveling: Losing Our Way in the New Century.

© 2007 The New York Times

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