Based on post-WWII data from sources like the Belfer Center and MeasuringWorth:
- GDP growth: Democrats avg. ~4.4% vs. Republicans ~2.4%
- Job creation: Democrats ~1.7-2.5% annual vs. Republicans ~1.0%
- Real wage growth: Higher under Democrats (e.g., Bartels study shows stronger income gains for most families)
- Deficit change: Mixed; Republicans often show lower debt growth overall (~4.9% vs. 7.9%), but deficits rose more under Republicans since 1981
- Inflation: Lower under Republicans (~2.5% vs. 4.9%)
Many external factors and lags affect results; no party "wins" all metrics.