Charles Dow was the original editor of the Wall Street Journal. He was the originator of “Dow Theory,” which holds that the prices of transportation stocks, such as Heartland Express, can predict changes in the price of industrial stocks, such as ExxonMobil.

Go to the Web site of the Federal Reserve Bank of St. Louis (FRED) (research.stlouisfed.org/fred2/) and download and plot on the same graph the data series for the Dow Jones Industrial Average (DJIA) and the Dow Jones Transportation Average (DJTA) from 1900 to the present. Explain whether the data in your graph support the Dow Theory.