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Shares are set for a muted open. Boral improves under new chief executive; AGL hit by writedowns. QBE pushes through more premium hikes. Follow updates here.

(Bloomberg) -- US Treasuries drifted higher after Fitch Ratings stripped the US of its top-tier sovereign rating, spurring modest demand for haven assets which counter-intuitively include debt issued by the world’s biggest economy. Most Read from BloombergUS Stripped of AAA Rating by Fitch as Budget Deficits SwellPoland Sends Troops to Belarus Border After Airspace BreachUS, Europe Growing Alarmed by China’s Rush Into Legacy ChipsMissing Goldman Sachs Analyst Confirmed Dead by New York PoliceTru

Shares drop at open; $A tumbles; Fitch downgrades US foreign currency ratings; Westgold expects lower costs for FY24; BWP Trust declares 9.27¢ dividend. Follow updates here.

(Bloomberg) -- Investors on Wall Street and beyond are betting that the great tech rally of 2023 has staying power, even as they appear skeptical that the artificial-intelligence era will live up to the hype. Most Read from BloombergLots of US Homeowners Want to Move. They Just Have Nowhere to GoBurning Ship’s Operator Says Almost 500 EVs Are on BoardBodegas Put on Notice as Visa Fights Back on Card SurchargesItaly Must Exit China Pact While Avoiding Crisis, Minister SaysArab States Sour on Isra

Nvidia is the poster child of the A.I. frenzy given its processors are used in computers that power A.I., rallying more than 200% this year alone.