By Mike Dolan

LONDON (Reuters) -What matters in U.S. and global markets today

By Mike Dolan, Editor-At-Large, Finance and Markets

World stock markets cooled a touch on Tuesday after another AI-spurred start to the week, with Washington’s shutdown putting the spotlight Federal Reserve speakers rather than data and overseas attention on Japan’s new prime minister and the absence of one in France.

AI-fueled risk appetite helped gloss over the messy political pictures to send Wall Street and world stock to new record closes on Monday – with MSCI’s all-country index now up almost 19% for the year. Chip stocks roared after AMD’s blockbuster supply pact with OpenAI, allowing the ChatGPT creator to buy a stake of up to 10% in the chipmaker and sending AMD’s stock up 24%.

With dealmaking gathe

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