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On the Maddeningly Inexact Relationship Between Unemployment and Re-Election

The most straightforward application is to compare the unemployment rate to the incumbent party’s performance in the popular vote. Historically, there has been no correlation between these variables:

An article in today’s Times notes, for example, that “no American president since Franklin Delano Roosevelt has won a second term in office when the unemployment rate on Election Day topped 7.2 percent.” The 7.2 percent figure refers to Ronald Reagan, who resoundingly won a second term when the unemployment rate was at that number in November 1984.

This type of data may be of limited utility for predictive purposes, however. Reagan won re-election by 18 points in 1984, suggesting that he had quite a bit of slack. An unemployment rate of 7.5 percent would presumably have been good enough to win him another term, as might have one of 8.0 percent, 8.5 percent or even higher.