Global stock markets staged a £200billion snapback on Thursday as the boss of the world ’s biggest firm shrugged off fears of an AI bubble. US giant Nvidia , whose technology is used heavily in the roll-out of artificial intelligence, revealed that its sales rocketed by 62% to £43.6billion in the three months to the end of October. Jensen Huang, its chief executive, said: “There has been a lot of talk about an AI bubble. From our vantage point we see something very different.” The results