How risky is it when interest rates are held too low for too long?:
Betting the house: Monetary policy, mortgage booms and housing prices, by Òscar Jordà, Moritz Schularick, and Alan Taylor: Although the nexus between low interest rates and the recent house price bubble remains largely unproven, observers now worry that current loose monetary conditions will stir up froth in housing markets, thus setting the stage for another painful financial crash. Central banks are struggling between the desire to awaken economic activity from its post-crisis torpor and fear of kindling the next housing bubble. The Riksbank was recently caught on the horns of this dilemma, as Svensson (2012) describes. Our new research provides the much-needed empirical backdrop to inform the debate about these trade-offs.
The recent financial crisis has led to a re-examination of the role of housing finance in the macroeconomy. It has become a top research priority to dissect the sources of house price fluctuations and their effect on household spending, mortgage borrowing, the health of financial intermediaries, and ultimately on real economic outcomes. A rapidly growing literature investigates the link between monetary policy and house prices as well as the implications of house price fluctuations for monetary policy (Del Negro and Otrok 2007, Goodhart and Hofmann 2008, Jarocinski and Smets 2008, Allen and Rogoff 2011, Glaeser, Gottlieb et al. 2010, Williams 2011, Kuttner 2012, Mian and Sufi 2014).
Despite all these references, there is relatively little empirical research about the effects of monetary policy on asset prices, especially house prices. How do monetary conditions affect mortgage borrowing and housing markets? Do low interest rates cause households to lever up on mortgages and bid up house prices, thus increasing the risk of financial crisis? And what, if anything, should central banks do about it?
Monetary conditions and house prices: 140 years of evidence
In our new paper (Jordà et al. 2014), we analyse the link between monetary conditions, mortgage credit growth, and house prices using data spanning 140 years of modern economic history across 14 advanced economies. Such a long and broad historical analysis has become possible for the first time by bringing together two novel datasets, each of which is the result of an extensive multi-year data collection effort. The first dataset covers disaggregated bank credit data, including real estate lending to households and non-financial businesses, for 17 countries (Jordà et al. 2014). The second dataset, compiled for a study by Knoll et al. (2014), presents newly unearthed data covering long-run house prices for 14 out of the 17 economies in the first dataset, from 1870 to 2012. This is the first time both datasets have been combined. ...
After lots of data and analysis, they conclude:
... We have established that loose/tight monetary conditions make credit cheaper/dearer and houses more expensive/affordable. But what about the dark side of low interest rates – do they also increase the risk of a financial crash?
The answer to this question is clearly affirmative, as we show in the last part of our paper using crisis prediction models. Over the past 140 years of modern macroeconomic history, mortgage booms and house price bubbles have been associated with a higher likelihood of a financial crisis. This association is even stronger in the post-WW2 era, which was marked by the democratization of leverage through the expansion of housing finance relative to GDP and a rapidly growing share of real estate loans as a share of banks’ balance sheets.
Our findings have important implications for the post-crisis debate about central bank policy. We provide a quantitative measure of the financial stability risks that stem from extended periods of ultra-low interest rates. We also provide a quantitative measure of the effects of monetary policy on mortgage lending and house prices. These historical insights suggest that the potentially destabilizing by-products of easy money must be taken seriously and considered against the benefits of stimulating flagging economic activity. Policy, as always, must strike a fine balance between conflicting objectives.
An important implication of our study is that macroeconomic stabilization policy has implications for financial stability, and vice versa. Resolving this dichotomy requires central banks to make greater use of macroprudential tools alongside conventional interest rate policy. One tool is insufficient to do two jobs. That is the lesson from modern macroeconomic history. ...