Stock-market investors are turning jittery over something which has apparently happened only two times in the bond market since the early 1980s: The 10-year Treasury yield has jumped by about as much as the Federal Reserve has cut interest rates over the same period of time.

Before the election, Donald Trump pretended he was solely responsible for Wall Street's upswing. That's a problem now that markets are struggling.

The stock market’s Trump-fueled honeymoon has fallen short of inauguration day. While the S&P 500 eked out a gain to start the week, the index remains effectively unchanged from the day before the election.

President Trump will have little direct impact on the stock market, but his policies, initiatives and posts certainly can make prices move. Here's how.