How can Wall Street be so healthy when Main Street isn’t?

The corner bars, the family restaurants, the hair salons and other small businesses across the U.S. that are teetering or closing for good aren’t listed on the stock market. Apple, Microsoft, Amazon, Facebook and Google’s parent company are, and movements in their stocks alone are dictating the action in the S&P 500 more than ever before.

The pandemic has accelerated work-at-home and other trends that have boosted Big Tech, and their profits are piling up. The five big tech-oriented giants are now worth a combined $7.6 trillion, and by themselves account for about 23% of the S&P 500′s total value.

Because stocks with the biggest market values carry the most weight in the S&P 500, the movements of Big Tech matter much more than what airlines, cruise-ship operators or other still-struggling companies are doing. American Airlines is down more than 50% for 2020 so far, but its much smaller market value means it doesn’t move the needle like Big Tech. It would take 280 American Airlines to have the heft of one Apple.