The economy has consistently performed dramatically better under Democratic presidents ever since we have been tracking economic performance.Median income has essentially not increased at all under Republican presidents while increasing by an average of 1% per year, after adjusting for inflation, under Democratic presidents. A more detailed breakdown of how income levels have changed under the parties, including the change for other income brackets, is available here Jobs have been created far more rapidly under Democratic presidents as well, with Democrats averaging 2.5 times more jobs being created each month. This figure could be somewhat misleading, given that two of the three most recent presidents have been Democrats, and the population is larger today than in the past. However, as you can see from a comparison of the presidents' jobs records it is not that simple- a number of Democratic presidents farther back in history beat more recent Republican presidents. For example, both President Carter and President Johnson beat all Republican presidents. In fact, only 2 of the top 8 presidents are Republican while all 4 of the worst 4 are Republican. So, the pattern appears to be fairly consistent.The gross domestic product has also grown approximately 2.5 times as fast under Democrats. 5 of the top 6 presidents for GDP growth are Democrats with the best Democratic president having 2.5 times as much GDP growth per year as the best Republican president.The dramatic gulf between the performance of the parties is not limited to the presidency. Democrats also dramatically outperform both at the state level and in the legislature The reasons the economy performs so much better under Democrats are a subject of much debate. Common explanations include a greater emphasis on expanding access to the benefits of economic growth to a broader slice of society, higher investments in societal foundations like education and scientific research and smarter regulation. But, whatever the explanation is, or the explanations are, the record is unequivocal.