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Jun 15, 2017

The Message In The Stock Market For The Economic Future

Sponsored Content provided by Robert Burrus - Dean , Cameron School of Business - UNC-Wilmington

This Insights article was contributed by Dr. Cetin Ciner, professor of finance at the Cameron School of Business

Stock prices, if determined in rational and operationally efficient markets, should reflect future profits. Since the earnings of corporations should be highly correlated with economic activity, stock-price changes should reflect the market’s expectations of economic growth.

In fact, according to this view, the overall stock market can be viewed simply as a mirror image of the overall consensus of traders about the future of the economy. In other words, the stock market should be used as a leading indicator for economic growth, and fiscal and monetary policy-making. This is why the Dow Jones composite index was included in the initial list of leading indicators for the economy.

This theory seemed to hold well when data from the 1950s to the early 70s were investigated by past researchers. However, when subsequent researchers included data from the 1980s and the 90s, the correlation between current stock valuations and future economic growth largely disappeared. Some researchers have even suggested that the stock market was driven by fads or bubbles after the 1980s, since it no longer reflected fundamental values.

I revisited this issue in a recent Cameron School of Business working paper. In a detailed econometric study, I looked at the time variation in the predictive power of the stock market for economic growth. I examined predictive power of the short-term (one month ahead) and long-term (12 months ahead). In the below graph, I present the results for the time varying explanatory power of the stock market for 12-month-ahead economic growth by using a relatively new technique called forecast error variance decomposition.



The vertical axis shows the percentage of economic growth explained by the stock market. As the graph illustrates, the predictive power of the stock market shows a steady decline after the 1970s, a finding consistent with prior work.

However, the chart also reveals that the predictive power of the stock market has gained new traction over last decade. In fact, in most recent data, the stock market regains its leading indicator status and explains 50% of the future of the economy. This is a remarkable forecasting success for the stock market and suggests that the stock market should again carry weight in the consideration of policymakers. Furthermore, it is good news for stockholders, as the rally of the last few years do not seem to be out of touch with fundamentals.

Of course, there is always a bit of caution because the relation could again decay. However, for the moment the stock market seems to be behaving rationally.

Robert T. Burrus, Jr., Ph.D., is the dean of the Cameron School of Business at the University of North Carolina Wilmington, named in June 2015. Burrus joined the UNCW faculty in 1998. Prior to his current position, Burrus was interim dean, associate dean of undergraduate studies and the chair of the department of economics and finance. Burrus earned a Ph.D. and a master’s degree in economics from the University of Virginia and a bachelor’s degree in mathematical economics from Wake Forest University. The Cameron School of Business has approximately 60 full-time faculty members and 20 administrative and staff members. The AACSB-accredited business school currently enrolls approximately 2,000 undergraduate students in three degree programs and 200 graduate students in four degree programs. The school also houses the prestigious Cameron Executive Network, a group of more than 200 retired and practicing executives that provide one-on-one mentoring for Cameron students. To learn more about the Cameron School of Business, please visit http://csb.uncw.edu/. Questions and comments can be sent to [email protected].
 

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