In U.S. business cycles, residential investment differs from consumption and business investment in two respects. First, residential investment leads US GDP, while business investment lags and consumption coincides with U.S. GDP. This lead-lag relationship is supported empirically by and widely studied in existing literature, e.g. in Green (1997) and Leamer (2007). Second, residential investment is more volatile than consumption and business investment. This chapter attempts to explain these two dynamic features of residential investment. This chapter defines the lead-lag relationship using the auto correlation of residential investment, consumption and business investment with GDP. For instance, residential investment leads GDP. What I mean by this is that residential investment has a higher correlation with future GDP than it has with previous and current GDP. Please refer to Appendix 4 for a detailed descriptions of the data and these second moments.
Understanding the dynamics of residential investment and its role in the business cycle is important. The United States’ aggregate housing value constitutes about half of the country’s aggregate private wealth, as documented by Greenwood and Hercowitz (1991). Therefore, the housing market is an important element affecting the behavior of consumption and investment. In addition, residential investment is a good predictor of economic recessions. In the past fifty years, eight of ten recessions (including the most recent one) were preceded by a severe reduction in residential investment, as discussed in Leamer (2007). Indeed, Leamer (2007) suggested that housing is the sector most important to economic recessions, and any attempt to control the business cycle needs to focus particularly on household investment.