S&P 500 is on a 12-month tear as tariffs threaten 2025 outlook for U.S. stocks MarketWatch2025 Outlooks Goldman SachsGoldman Sachs: Trump tax cuts, deregulation will boost growth; tariffs could be a drag Fox BusinessBrokerages see 'uncertain' 2025 on worries over potential Trump tariffs ReutersGoldman Sachs tells investors Trump’s tariffs pose a major ‘event risk’ and to expect growth to slow in 2025 Fortune