- Past financial crises have led to severe, prolonged recessions. The average fall in real per capita GDP was 9 percentage points, and the average period of falling output was 2 years. ('Ordinary' recessions generally last less than a year.) The NBER puts the beginning of the current recession at December, 2007. That suggests that the economy will continue contracting through the end of 2009.
- The average increase in unemployment was 7 percentage points, and the average period of rising unemployment was 5 years. (That's bad news for anyone who's looking for work.
- The average real (i.e., inflation-adjusted) stock price decline was 55%, and the average period of declining prices was 3.4 years.
- The average real home price decline was 35%, and the average period of declining prices was 6 years.
In other words, we shouldn't expect the current downturn to play out dramatically better than the numbers above would suggest.
The good news (if there is any) is that real home prices have already fallen almost 35% from the peak, which occurred in the summer of 2006. If the current crisis follows the historical script, prices might actually stabilize at their current levels and remain there until 2010 or 2011. Throw in declining mortgage rates and (with any luck) a relaxation of the current tough lending standards, and buyers may finally get a break. (Remember, however, that we're talking about the national housing market, not just San Francisco. Prices here have fallen only about 25%, in real terms. And of course, the survey statistics quoted above are historical averages, not laws of nature.)
By the way, the Reinhart-Rogoff paper is easily readable by anyone who isn't intimidated by ordinary bar charts. If you prefer something even lighter, however, you can try their recent Wall Street Journal article. Unfortunately, the Journal often restricts access to subscribers, so I can't promise how long the article will be accessible.
Over the last twenty years, the average rate on 30-year mortgages has been about 7.5%. You could start by assuming that the future will look like the past, and that the average mortgage rate going forward will be 7.5%. The problem with that approach is that much of the historical variation in mortgage rates was driven by inflation, which arguably will be lower in the future. I've included a measure of inflation on the same chart. Although the correlation is far from perfect, it seems clear that mortgage rates have trended lower in response to lower inflation. That suggests that we should focus on the difference between mortgage rates and inflation, i.e., the so-called real mortgage rate.
Unlike the stated nominal mortgage rate, the implied real rate has been fairly stable over time. (For most of the last twenty years, it remained in a band between 4% and 6%.) That's to be expected. Since it erodes the value of lenders’ capital, inflation should be regarded as a cost of doing business. Lenders will therefore subtract the inflation rate from the nominal interest rate in order to calculate the true return from lending money. In other words, lenders ultimately care more about real interest rates than nominal interest rates. Assuming that lenders' return expectations are stable over time, we'd therefore expect real mortgage rates to be stable as well, even when inflation fluctuates.
The shaded regions indicate recessions, as defined by the National Bureau of Economic Research (the commonly accepted arbiter of recessions in the United States). According to the NBER, the 1990-91 recession began in July, 1990, and ended in March, 1991. The Fed didn't start raising short term interest rates until February, 1994, almost three years later. The 2001 recession began in March, 2001, and ended in November of the same year. The Fed didn't start raising rates until June, 2004, over two and a half years later.