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“In the financial markets, a lack of liquidity immediately leads to falling prices,” said Lou Barnes, the founder of Boulder West Financial Services. (Boulder West was acquired last year by Premier Mortgage Group.) “In the real estate market, something different happens,” he added. “Illiquid real estate markets freeze.” That is what is happening now. For months, the Obama tax credit had been the only grease in the housing market. Now that it is gone, the buying and selling of houses is essentially grinding to a halt.

Why is this happening? Just as the subprime bubble of 2006 and 2007 required one kind of perfect storm  namely, incentives to throw underwriting standards out the window  we are now living through the opposite kind of perfect storm. Essentially, every participant in the housing market has a reason to be afraid. And that fear is paralyzing.

The prospective buyer, for instance, has two good rationales to fear buying a new home. One is the unemployment rate. “A major psychological thing happens with high unemployment,” says Dave Zitting, a veteran mortgage banker and founder of Primary Residential Mortgages. “Those with a job worry about whether they are going to keep that job”  which, in turn, prevents them from taking the plunge on a new home.

The second reason is that, Mr. Yun notwithstanding, most people simply do not believe that housing prices are even close to hitting bottom. “In the Bay Area, a house that was worth $300,000 a decade ago became a million-dollar home,” said Greg Fielding, a real estate broker and blogger. “Now it is listed at $800,000.” That price, he suggested, was still unrealistically high. The seller, meanwhile, doesn’t want to face the fact that his or her home is too richly priced, and won’t sell at a more realistic price  which may well be below his or her mortgage debt.

There is also an immense amount of inventory that has yet to hit the market but will, sooner or later. People in the real estate business have taken to calling this “the shadow inventory.” It consists of homes for which the owners have stopped paying the mortgage but the banks haven’t foreclosed on yet, foreclosed properties that have not yet been put up for sale, homes with modified mortgages that the owners still can’t afford and will soon default on and so on.

Mr. Barnes describes the shadow inventory as akin to “ranks of Napoleonic infantry, rows deep, hidden in the fog.” This inventory, estimated by Rick Sharga of RealtyTrac to be between three million and four million homes, is almost certain to drag down home prices for the foreseeable future. “The disinterest of buyers, in an interest-rate environment that may be the lowest ever, is striking,” Mr. Barnes said. But, he added, it makes perfect sense. Since 2007, housing prices have been in a deflationary spiral, and nobody can say when it will end. “It doesn’t matter if interest rates go down to 2 percent,” Mr. Barnes said  buyers won’t reappear in big numbers until they can see the light at the end of the tunnel.

So that is what it looks like for the prospective borrower. Now look at it from the lender’s perspective. Chastened by the excesses of the bubble, mortgage lenders have swung hard in the other direction, becoming excessively, almost insanely, conservative. They demand high FICO scores. They won’t lend to anyone who is recently self-employed  even if the potential borrower has socked away a lot of money in the bank, or is making a good income. They won’t count income from capital gains.