Long-dated US Treasuries could lose buyers to the AI buildout, pushing yields and government funding costs higher. Microsoft, Google and Amazon offer debt at a spread over Treasuries while generating over $100 billion a year in cash flow and 30%+ returns on capital, a better deal than lending to the government at 4.5%. Beyond about $725 billion of hyperscaler capex, debt for fabs, memory, power and the grid is about $3-5 trillion through 2030, comparable to Treasury issuance over that period. x.comÂ