From 1h agoIntroduction: Nvidia hits record quarter on AI chip boomGood morning, and welcome to our rolling coverage of business, the financial markets and the world economy.A fresh wave of AI optimism has lifted the stock market after chip designer Nvidia reported another set of record-breaking earnings last night.The company, which designs chips critical for AI tech, reported an 85% year-on-year rise in revenue to $81.6bn in the three months ended in April, marking the 15th consecutive quarter of beating Wall Street estimates.Nvidia forecast $91bn in sales for its current quarter, well above average investor expectations of $86bn, but short of the highest estimates. Its shares are down 1% in after hours trading, reflecting some worries among investors about how long the company can keep up its incredible growth trajectory.Still, the revenue beat has lifted the mood in Asian stock markets: the South Korean Kospi has staged a dramatic 9% rise, while Taiwanese shares have risen by 3.3%, snapping a four-day losing streak. LG Electronics and Hyundai Mobis both rose by more than 20% after Nvidia boss Jensen Huang said that physical AI and robotics was the “second category” for major growth.Elsewhere this morning, Wes Streeting, the former health secretary, has called for a “wealth tax that works”.Speaking to the BBC, he proposed equalising capital gains tax with income tax, which he said could raise £12bn a year.Streeting suggested that CGT rates should mirror the three bands of income tax of 20%, 40% and 45%, according to the BBC. He told the broadcaster’s Political Thinking podcast that loopholes should also be closed that allow people to disguise income from work as capital gains, and that lower rates of capital gains tax could be offered to entrepreneurs who are building companies.His comments come after his resignation as health secretary last week, after several Labour MPs urged prime minister Keir Starmer to step down.The agenda