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April 22, 2014

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Posted: 22 Apr 2014 12:03 AM PDT

'House Prices and Secular Stagnation'

Posted: 21 Apr 2014 10:02 AM PDT

Simon Wren-Lewis:

House prices and secular stagnation: This post starts off talking about the UK, but then goes global
 ...Housing is becoming more and more unaffordable for first time buyers. Yet prices are currently booming (at least in London), and demand is so high estate agents are apparently now holding mass viewings to cope. In the UK the media now routinely call this a bubble, and the term 'super bubble' is now being used. ...
Bubbles are where prices move further and further away from their fundamental value, simply because everyone expects prices to continue to rise. ...
If we think of housing as an asset, then the total return to this asset if you held it forever is the weighted sum of all future rents, where you value rents today more than rents in the future. Economists call this the discounted sum of rents. (If you are a homeowner, it is the rent that you are avoiding paying.) So why would house prices go up, if rents were roughly constant and were expected to remain so? The answer is that prices would go up if the rate at which you discounted the future fell. The relevant discount rate here is the real interest rate on alternative assets. That interest rate has indeed fallen over much the same time period as house prices have increased, as Chapter 3 of the IMF's World Economic Outlook for March 2014 documents. ...
It is the expected return on other assets that matters here. The fact that actual real interest rates have fallen in the past would not matter much if they were expected to recover quickly. A key idea behind today's discussion of secular stagnation is that real interest rates might stay pretty low for a long period of time. That in turn implies that house prices will be much higher relative to incomes than they were when real interest rates were higher.
So what appears to be a bubble may instead be a symptom of secular stagnation. ...
Does this mean we should stop calling what is happening in the UK a bubble? The first point is that secular stagnation is just an idea, and it may prove wrong, and if it does house prices may come tumbling down. Second, even if it is not wrong, it is still possible to have a bubble on top of the increase implied by lower interest rates. Indeed one of the concerns about the lower real interest rates associated with secular stagnation is that, by raising asset prices not just in housing but elsewhere, it may encourage bubbles to develop on top. So all we can say with certainty, for the UK at least, is that the Financial Policy Committee will have their work cut out when they next meet in June.

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