Stocks are rallying hard as the economy refuses to buckle. Will it last in 2025? - MarketWatch

1. U.S. stocks are hitting record highs, encouraged by deregulation and tax cuts. 2. Nvidia, part of the 'Magnificent Seven', leads with 31% of S&P 500 cap. 3. Trump's anticipated tariffs might negatively affect megacap tech stock revenues. 4. The Fed's potential interest rate cuts may influence market dynamics and growth. 5. Persistent inflation concerns could challenge Wall Street's optimistic forecasts.