Should You Buy Index Funds Now, in an Overvalued Market

As a passive investor, is it wise to buy market tracking index funds and ETFs from companies like Blackrock, Vanguard and State Street, even when they're at all time highs? Jack Bogle (founder of the Vanguard group) spent most of his career working in the passive investing field and in this video, we break down his thoughts as to dollar cost averaging in an overvalued market.