JPMorgan Chase & Co.'s trading desk predicts a likely boost for stocks following the Federal Reserve's announcement of an interest-rate hike and a possible pause at the next meeting. They assign a 65% probability to this scenario, which they believe could push the S&P 500 as much as 0.75% higher. Despite skepticism, equities have recovered their losses since the Fed began raising rates 16 months ago, with the S&P 500 now trading roughly 5% above where it was at the start of the hiking cycle.