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US stocks could soar up to 20% in the first half of next year, Jeremy Siegel said. The Fed may cut interest rates to as low as 2% by the end of 2023, the Wharton professor said. Improved worker productivity might shore up company profits and buoy stocks, Siegel said.US stocks could surge as much as 20% in the first six months of 2023 as the Federal Reserve ends its inflation fight and shifts its focus toward shoring up economic...