Mark DeCambre in Market Watch compared U.S. presidents’ first 100 days performance of the Dow Jones Industrial Average. The first 100 days since the Trump election in November, the Dow increased by 14.22 percent. A pretty strong rally by all measures. However, Mr. Decambre points out that first 100 days after Bill Clinton’s re-election in 1996, the Dow increased by 14.48 percent, and the largest gain was experienced by Franklin D. Roosevelt in 1932 when the Dow increased a whopping 46.2 percent.

Furthermore, having a great Dow performance in the first 100 days after an election appears not to be a good predictor of economic performance over the course of an administration. H....