U.S. equities are experiencing volatility, with the S&P 500 testing the 5,000 to 5,500 range, closing above 5,500 amid optimism for a tariff deal with China and a dovish Federal Reserve. Morgan Stanley's Michael Wilson suggests that a sustained move beyond 5,600-5,650 requires significant developments, including reduced tariffs, accommodative monetary policy, and improved earnings revisions. He emphasizes the importance of interest rates, noting that a drop below 4% could lead to an upside breakout, while a rise above 4.5% may signal risk-off behavior.