It's not just GameStop worrying Wall Street about a bubble

FILE - In this Oct. 14, 2013 file photo, Nobel prize-winning Yale University economist Robert Shiller smiles at a news conference in New Haven, Conn. Now, even the pros on Wall Street are asking if stock prices have shot too high. The U.S. stock market has been on a nearly nonstop rip higher since March 2020, surging roughly 70% to record heights. “You might say a bubble occurs when people think that the market is going to go up but worry that it may drop,” said Shiller (AP Photo/Jessica Hill, File)

In this photo provided by the New York Stock Exchange, Robert Moran, left, works with fellow traders on the floor, Tuesday Feb. 2, 2021. Stocks were broadly higher in afternoon trading Tuesday, but shares of closely watched companies like GameStop and AMC Entertainment were falling sharply. (Colin Ziemer/New York Stock Exchange via AP)