Note from dshort: The CMI charts have been updated through December 2, which includes Black Friday and Cyber Monday and the three following shopping days. The Growth Index is now at -4.41. The underlying Weighted Composite Index had dropped below the Growth Index, which is the 91-day moving average of the Composite. At this point, there's not much to cheer about.
I regularly follow the Consumer Metrics Institute's Daily Growth Index in the series of charts posted below. Here is a link to the Institute's website. Their page of frequently asked questions is an excellent introduction to the service. See also the Institute's November 23rd commentary, First Revision to the Third Quarter GDP.
The charts below focus on the 'Trailing Quarter' Growth Index, which is computed as a 91-day moving average for the year-over-year growth/contraction of the Weighted Composite Index, an index that tracks near real-time consumer behavior in a wide range of consumption categories. The Growth Index is a calculated metric that smooths the volatility and gives a better sense of expansions and contractions in consumption.
The 91-day period is useful for comparison with key quarterly metrics such as GDP. Since the consumer accounts for over two-thirds of the US economy, one would expect that a well-crafted index of consumer behavior would serve as a leading indicator. As the chart suggests, during the five-year history of the index, it has generally lived up to that expectation. Actually, the chart understates the degree to which the Growth Index leads GDP. Why? Because the advance estimates for GDP are released a month after the end of the quarter in question, so the Growth Index lead time has been substantial.
Has the Growth Index also served as a leading indicator of the stock market? The next chart is an overlay of the index and the S&P 500. The Growth Index clearly peaked before the market in 2007 and bottomed in late August of 2008, over six months before the market low in March 2009.
The most recent peak in the Growth Index was around the first of September, 2009, almost eight months before the interim high in the S&P 500 on April 23rd. Since its peak, the Growth Index declined dramatically and remains deep in contraction territory although the contraction has become less severe.
It's important to remember that the Growth Index is a moving average of year-over-year expansion/contraction whereas the market is a continuous record of value. Even so, the pattern is remarkable. The question is whether the latest dip in the Growth Index is signaling a substantial market decline like in 2008-2009 or a buying opportunity like in June 2006. I've also highlighted the recession that officially began in December 2007 and ended in June 2009. As a leading indicator for GDP, the Growth Index also offers an early warning for possible recessions.
Perhaps the most astonishing chart is the one below, which compares the contraction that began in 2008 with the one that began in January of this year. I've reproduced a chart on the Institute's website and added annotations for the elapsed time and the relationship of the contractions to major market milestones.
Among other things, this chart illustrates the more subtle and pernicious nature of the current decline in consumption. The 2010 decline has exceeded both the length and depth of the complete 2008 contraction cycle — the combined contraction and recovery.