The current AI boom is not sustainable, a Deutsche Bank research note warned this morning, because tech spending won’t “remain parabolic.” AI capex is now so massive it is keeping the U.S. out of recession, the bank said. Separately, Bain & Co. estimate there will be an $800 billion shortfall in the revenues needed to fund the demand for AI computing power. About half the S&P 500’s gains this year have been driven by tech stocks. On the heels of Nvidia’s $100 billion investment in OpenAI, two research ...