STAN CHOE AP Business Writer Stocks are mixed in tentative midday trading on Wall Street Tuesday, as investors wait to see how well the lifting of lockdowns around the world goes. The S&P 500 and other U.S. indexes were flipping between small gains and losses, following up on mixed performances in Europe and Asia. Treasury yields were down slightly, but a measure of nervousness in the U.S. stock market also eased to its lowest level in two months. Governments around the world and in many U.S. states have begun gradually lifting restrictions on businesses, which were meant to slow the spread of the coronavirus outbreak but also caused a severe recession. Expectations that the reopenings will let growth resume have helped drive the S&P 500 up about 30% since late March. But Sout
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