General Motors (GM) Indicator
A theory stating that the performance of automaker giant General Motors (GM) is a pre-cursor to the performance of the U.S. economy and stock market. In other words, when people are confident and making money one of the first things they would do is go out and buy a new car.
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The Media As A Lagging Indicator
See also: Aspirin Count Theory, Bellwether, Indicator, Leading Lipstick Indicator, Skirt Length Theory