On average, since the inception of the Standard and Poor’s composite stock index in 1926, the reward for putting your money in the market has been about 16 percentage points lower per presidential term under Republicans than under Democrats. Republican underperformance remains a stubborn fact even when the Great Depression and World War II are left out of the analysis (in the fond hope that they will prove to have been unique experiences).
如果采用股票回报来衡量经济表现，那么，在延长历史分析的情况下，共和党的经济表现不足模式也是如此。平均而言，从1926年标准普尔综合股票指数开始以来，共和党当政时期的股市回报率要比民主党低大约十六个百分点。即使把大萧条时期和二战排除在外，共和党表现不佳也是顽固不变。