Global markets tumble on Credit Suisse signs of instability

Trouble at a major European bank injected fresh fear into global financial markets. Shares in Credit Suisse plunged after its largest lender ruled out a rescue. That touched off a broader sell-off a day after Wall Street appeared to weather the collapse of two U.S. banks. Peter Conti-Brown joined William Brangham and discussed the turmoil and what it means for the banking sector.