The odds are very high that any US administration ends up with the economy better four years later than at present.

Probabilistic claim about the US economy four years after an administration starts. Primary test: the administration then beginning (January 2017 to January 2021), with US real GDP and real GDP per capita (BEA) at the end of 2020 compared with the end of 2016. Secondary test: the historical record that 'any administration' implies, namely whether real GDP was higher at the end of nearly all (at least about 80%) of post-war four-year presidential terms. True: both tests hold. Mostly true: the historical pattern holds and the 2017–2021 term ended with higher real GDP but lower per-capita output or employment. Mixed: one test holds and the other fails. Mostly false: the 2017–2021 term ended with the economy worse and the historical pattern holds only weakly (60–80%). False: both tests fail.

Set before the research began.

1. E1 The Economic Record of Biden and Trump Compared to That of Presidents Since Truman An Economic Sense (aneconomicsense.org) · 2 February 2025

   “Per capita real GDP grew at an average annual rate of 2.5% under Biden, which is the highest in any presidential term since Clinton’s second term. And it is almost twice as high as the average rate of growth of just 1.3% per year during Trump’s first term.”

2. E2 The Economic Record of Biden and Trump Compared to That of Presidents Since Truman An Economic Sense (aneconomicsense.org) · 2 February 2025

   “Trump’s economic record in his first term, in contrast, was relatively poor. It was not the worst among the post-World War II presidential terms, but in terms of growth it was around the bottom third mark.”

3. E3 The Relative Performance of the Economy under the Presidents of the United States from 1900 to 2025 MeasuringWorth (Samuel H. Williamson, Miami University) · February 2025

   “2020 IV | 20,772 | 3,702 | 17,070 | Trump | 1.85% | 2.22% | 1.77%”

4. E4 The Relative Performance of the Economy under the Presidents of the United States from 1900 to 2025 MeasuringWorth (Samuel H. Williamson, Miami University) · February 2025

   “2016 IV | 19,304 | 3,390 | 15,915 | Obama | 1.99% | -0.25% | 2.54%”

5. E5 Gross Domestic Product, Fourth Quarter and Year 2020 (Advance Estimate) U.S. Bureau of Economic Analysis · 28 January 2021

   “Real gross domestic product (GDP) increased at an annual rate of 4.0 percent in the fourth quarter of 2020 (table 1), according to the "advance" estimate released by the Bureau of Economic Analysis.”

6. E6 Presidents and the Economy: A Forensic Investigation Alan S. Blinder and Mark W. Watson, Princeton University · November 2013

   “The U.S. economy has performed better when the President of the United States is a Democrat rather than a Republican, almost regardless of how one measures performance.”

The primary test appears to hold. E1 reports that real GDP per capita grew at an average annual rate of 1.3% during Trump's first term, which means per-capita output, and therefore real GDP, was higher at the end of the term. E3 and E4 are consistent with this (Q4 2020 at 20,772 against Q4 2016 at 19,304), though those table rows do not label their columns. The secondary test cannot be settled: no evidence counts how many post-war four-year terms ended with higher real GDP. E2 places Trump's term in roughly the bottom third for growth, which suggests most terms grew but does not establish the roughly 80% threshold, and E6 reports only differences by party. With the historical test unresolved, the criteria for true, mostly true or mixed cannot be applied.