Stock markets are on a tear, and investors face a tricky question: Will this rally last?The S&P 500 index is on track for its fifth consecutive week of gains, its longest winning streak since the fall of 2021.It’s a remarkable run, following drastic actions taken by the Federal Reserve to contain historically high inflation. Many investors feared that the Fed’s series of interest rate increases would push the country into a more severe downturn. But the S&P 500 is roughly 17 percent higher than a year ago, almost 24 percent above its low in October, and just 8 percent away from a record.Some investors have even labeled this run the start of a new bull market, a period of exuberance that by one definition is marked by a 20 perce …
