With the Dow crossing 25,000, it’s worth pointing out the pitfalls that could reverse some of those gains — and how to avoid them.

One thing we don’t have to worry about is the economic sanity of President Trump.

In fact, it’s safe to say that the current president, for all his temperamental flaws and petty insecurities, makes his tightly wound predecessor, Barack Obama, look like a raving madman when it comes to showing sense on economic growth. Armchair psychiatrists are having a field day diagnosing the president’s mental state from afar, especially after his increasingly bizarre tweeting, but the market says otherwise.

Consider: The United States had one of the highest corporate tax rates in the world — so high that companies (and jobs) were fleeing to places like Ireland. That’s why it was perfectly sane to lower the corporate tax rate from 35 percent to 21 percent as Trump just did, and presto: Corporations are announcing plans to hire more workers, and the economy, which was expected to slow after seven years of weak growth, is heating up. The markets are predicting that growth with their surge.