After a series of roller-coaster rides in financial markets, serious concerns remain about the long-term profitability of major artificial intelligence (AI) companies that mostly rely on circular financing – investing in each other to prop up demand. This volatility is worrisome when many Americans’ retirement pensions are closely tied to AI stocks, which have contributed to 80 per cent of the US stock market’s rise and 40 per cent of US GDP growth last year. Amid fears of a bubble, polls...