Jack Bogle is the founder and chairman of mutual-fund giant Vanguard Group and is widely credited for popularizing index funds, a staple for buy-and-hold investors.
Today, he was on CNBC, and he had a bit of a startling prediction.
CNBC anchor Scott Wapner put the question to Bogle: “You say, ‘prepare for at least two declines of 25-30 percent, maybe even 50 percent, in the coming decade.’ ...