Where have we seen this before? Trump inherits a solid financial situation and squanders it. S&P 500 Has Performed Far Worse Under Trump Than Under Obama So much for having the “best” stock market returns. During his first two years in office, Donald Trump regularly pointed to the stock market as proof of his leadership’s effectiveness. Experts may have shaken their heads, saying that stock values aren’t an accurate measure of the country’s economic performance. But they are popular with voters, who check their 401(k) investments, and, thus, with politicians. Particularly since “presidents can have a major impact on the financial markets in the short run,” said David Kass, professor of finance at the University of Maryland.