شاخص مورد علاقه آمریکا، سرمایه گذاران را در مورد وضعیت بازار سهام گمراه می کند

America’s favorite index is misleading investors about the state of the stock market

For decades, the S&P 500 has been the preferred benchmark for monitoring the performance of the U.S. stock market. But these days, it is behaving less like a barometer of broad market health and more like a funhouse mirror.