Recent swings in major tech stocks are bringing back fears of an artificial intelligence bubble, and some experts cautioned that if it pops, the fallout could be bigger than anything Wall Street has ever seen.
Bubble or no bubble?
"There are many indications that we are in a bubble," said Itay Goldstein, a finance professor at the University of Pennsylvania's Wharton School.
"It seems likely that there is overpricing," he added.
The numbers back him up. The five biggest companies on Wall Street, all tech giants, are worth a combined $18 trillion, almost the size of China's entire economy.
