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Billionaire investor David Tepper is "leaning short" on the stock market heading into 2023.Tepper is bearish on stocks because of the ongoing tightening by central banks around the world."The upside/downside doesn't make sense to me when I have so many central banks telling me what they're going to do," Tepper told CNBC.Billionaire hedge fund manager David Tepper is "leaning short" on the stock market heading into 2023 for the...