Why did chip-maker Nvidia’s profits soar and is it living in a tech bubble?

Firm’s relentless focus on AI paid off in spades, with analysts optimistic of further successBusiness live – latest updatesThe stock market darling on everyone’s lips is Nvidia, which makes the processing chips that power everything from home computers to industrial machinery to cutting-edge artificial intelligence technology.On Thursday, the company stunned Wall Street with results that blew the roof off analysts’ expectations, reporting $13.5bn in quarterly profits, $2b