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- Economist David Rosenberg warns the stock market is in a "mega-bubble."
- Rosenberg cites high valuations, investor positioning, and sentiment as warning signs.
- Despite recent market gains, Rosenberg predicts a recession and advises caution in investing.
It's a tempting time to jump into the stock market. The S&P 500 continues to register new highs and has climbed an incredible 23% so far this year. That's on the heels of a 22% gain in 2023.