S&P 500 has its worst day since October. Here's why stocks were down.

Market Reaction - U.S. stocks experienced a significant decline on January 20, with the S&P 500 index recording its worst performance in three months, closing down 2.06% or 143.15 points at 6,796.86 [1][2] - The tech-heavy Nasdaq fell by 2.39%, losing 561.065 points to close at 22,954.322, while the Dow Jones Industrial Average decreased by 176% or 870.74 points, ending at 48,488.59 [2] Tariff Threats - President Trump announced plans to impose additional tariffs of 10% on goods from Denmark, Norway, Sweden, France, Germany, the Netherlands, Finland, and Great Britain, set to increase to 25% by June 1 [1] - Trump also threatened to impose 200% tariffs on French wines due to tensions with French President Emmanuel Macron [2] Treasury Yields and Safe Haven Assets - The benchmark 10-year Treasury yield rose to 4.293%, with analysts indicating that yields above 4.50% could pose challenges for markets and the economy [4] - Gold prices surged to a record high above $4,700 per ounce as investors sought safe-haven assets amid market volatility [3] Economic Outlook - Despite recent market volatility, economists maintain a positive outlook on the U.S. economy, citing "Goldilocks" economic data that supports market stability [5] - Upcoming inflation data, specifically the personal consumption expenditures price index, is anticipated to provide further insights into economic conditions [5]