The Dow fell more than 600 points on midday on Monday.<br />Monday marked the first day of trading in 2021.<br />Experts say the dip was caused by investors becoming worried about the pandemic and economic recovery in 2021.<br />The Dow closed 1.3%, or 383 points, lower, while the S&P 500 fell 1.5%.<br />The Nasdaq Composite (COMP) also closed 1.5% lower.
