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What a Mess

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Dhaval Joshi awhile back discussed the $4 trillion dollar mortgage problem:
Can the US economy really return to “business as usual” when it has 4 million houses surplus to requirement, when 1 out of 4 mortgages are in negative equity, and when by our calculation, it is burdened with $4 trillion of excess mortgage debt, equivalent to 30% of GDP?

For many years, total mortgage debt consistently and reliably equalled 0.4 times the value of the US housing stock. Intuitively, this average of 0.4 makes perfect sense as every property usually has a mortgage ranging from 0 to 0.9 times its value. So in 1990, $6 trillion of housing collateral could support $2.5 trillion of mortgages, and by 2006, $23 trillion of housing collateral could support $10 trillion of mortgages. But since then, the US housing stock’s value has slumped to $16 trillion which means the amount of mortgage lending supportable by the collateral has plunged to $6 trillion. However, actual mortgage debt has remained at $10 trillion – $4 trillion too high.

The fact that mortgage debt has barely declined suggests that relatively few homeowners have defaulted on their mortgages or paid off debt yet. Instead, a quarter of all borrowers are sitting on negative equity. That’s just as well – because were mortgage debt to shrink by even half of $4 trillion, the US economy would slump.
Here is the accompanying figure:



[Update: the greenish line in the top panel should be labeled "U.S. residential real-estate assets multiplied by 0.4." The 0.4 represents the how much mortgage debt has been as a percent of the U.S. housing stock historically.  Joshi considers it the sustainable level of mortgage debt given the collateral value of housing. I added the second paragraphs above to make this clearer.]
 
I was reminded of Joshi's article after reading this by Tyler Cowen:
It seems increasingly clear that we must [let house prices fall].  For how long can the government prop them up?  Are we never to have a private market in mortgages again?

Yet what happens if we let them fall?  Arguably many banks would once again be "under water."  Enthusiasm for another set of bailouts is weak, to say the least.  Our government would end up nationalizing these banks and it still would be on the hook for their debts.  The blow to confidence would be a major one, especially if along the way we saw a recreation of a Lehman or Bear Stearns or A.I.G. episode.

I increasingly believe there is no easy way out of this dilemma and it is a major reason why the U.S. economy remains stuck.  Housing prices must fall, yet...housing prices must not fall.
What a mess we are in.  So what can be done? My recommendation is (1) have the Fed take more aggressive actions to stabilize the macroeconomy which would make it easier to (2) do the structural changes needed to address the problems outlined above.  One specific structural proposal would be to swap underwater mortgage debt for equity. What suggestions do you have?

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