In this video from Monday's edition of the Motley Fool's Investor Beat, host Chris Hill and Fool analyst Jason Moser take a hard and fast look at the top investing stories of the day.

For the first time in 13 years, the Nasdaq broke 4,000. The last time it happened was back in 2000, when irrational exuberance drove the markets into a bubble that devastated many investors when it popped. Are we heading down a similar path today? In the lead segment on today's Investor Beat, Chris and Jason discuss what's similar about today's market to the one in 2000, and what's changed.

Then, Wal-Mart CEO Mike Duke has announced that he will step down, with the current head of Wal-Mart International, Doug McMillon, to take his place. The guys discuss why they like the move, what McMillon brings to the table at Wal-Mart, and why this may be a hint at Wal-Mart's future direction.

And finally, BlackBerry has announced a major shake-up, with its COO, CFO, and CMO all leaving the company. The company only very recently set John Chen in place as CEO to replace ousted former CEO Thorsten Heins. Is this a move to clean house by Chen to prepare for a turnaround, or a signal that the end is near for BlackBerry? Jason and Chris discuss these shifts at BlackBerry, and what future the company may have left.