A little holiday cheer ...



Discussions of the business cycle frequently focus on consumer spending (PCE: Personal consumption expenditures), but the key is to watch private domestic investment, especially residential investment. Even though private investment usually only accounts for around 15% of GDP, the swings for private investment are significantly larger than for PCE during the business cycle, so private investment has an outsized impact on GDP at transitions in the business cycle.



The first graph shows the real annualized change in GDP and private investment since 1960 (this is a 3 quarter centered average to smooth the graph).



GDP has fairly small annualized changes compared to the huge swings in investment, especially during and just following a recession. This is why investment is one of the keys to the business cycle.



Click on graph for larger image.



Note that during the recent recession, the largest decline for GDP was in Q4 2008 (a 8.9% annualized rate of decline). On a three quarter center averaged basis (as presented on graph), the largest decline was 5.9% annualized.



However the largest decline for private investment was a 43% annualized rate! On a three quarter average basis (on graph), private investment declined at a 35% annualized rate.



The second graph shows the contribution to GDP from the four categories of private investment: residential investment, equipment and software, nonresidential structures, and "Change in private inventories". Note: this is a 3 quarter centered average of the contribution to GDP.



This is important to follow because residential investment tends to lead the economy, equipment and software is generally coincident, and nonresidential structure investment lags the business cycle. Red is residential, green is equipment and software, and blue is investment in non-residential structures. The usual pattern - both into and out of recessions is - red, green, and blue.



The dashed purple line is the "Change in private inventories". This category has significant ups and downs, but is always negative during a recession, and provides a boost to GDP just after a recession.



The key leading sector - residential investment - has lagged this recovery because of the huge overhang of existing inventory. Usually residential investment is a strong contributor to GDP growth and employment in the early stages of a recovery, but not this time - and that weakness was a key reason why the recovery was sluggish so far.



Residential investment finally turned positive during 2011 and made a positive contribution to GDP in 2012.



What does this mean for the business cycle? Usually residential investment would turn down before a recession, and that isn't happening right now. Instead residential investment is starting to increase.



The third graph shows residential investment as a percent of GDP. Residential investment as a percent of GDP is just above the record low, and it seems likely that residential investment as a percent of GDP will increase further in 2013.



The key downside risk for the US economy in 2013 is too much austerity, too quickly. However, barring a policy mistake (I expect a fiscal agreement), it seems unlikely there will be a sharp decline in private investment in 2013. This is because residential investment is already near record lows as a percent of GDP and will probably increase further in 2013, and that suggests the US will avoid a new recession in 2013.