In the wake of the collapse of companies like AIG (NYSE:AIG), Fannie Mae (NYSE:FNM), Freddie Mac (NYSE:FRE), and Merrill Lynch (NYSE:MER), and with unemployment rising and the markets dropping, are we on the verge of another Great Depression? Should long-term investors still be bullish on the stock market or is Berkshire Hathaway Chairman Warren Buffett's optimism misplaced? What should investors expect over the next decade?

In this 19-minute audio interview, Motley Fool retirement expert Robert Brokamp puts these questions to Vanguard founder Jack Bogle, author of Enough: True Measures of Money, Business, and Life. For the text version of this interview, click here.

(Please note: This interview is not downloadable.)