The Nasdaq fell on Thursday, dragged down by losses in Big Tech shares, while see-saw trade lifted the S&P 500 slightly higher in the afternoon, and a shift into other sectors lifted the Dow as investors digested new economic data. Technology shares reversed early gains to move lower, weighing on the Nasdaq, as investors worried about hyperscaler spending on artificial intelligence and who foots the bill, fears that outweighed upbeat signals on AI demand from Micron (MU.O), and Qualcomm…