You might have noticed an interesting phenomenon in recent weeks. News about the implementation of President Donald Trump's tariffs tends to cause the stock market to sink like a brick. However, even the slightest hint that those tariffs will be relaxed or delayed usually causes stocks to rebound.

U.S. stocks are drifting in mixed trading as they near the end of another roller-coaster week. The S&P 500 edged higher by 0.3% Friday, though the majority of stocks were