United Kingdom, Feb. 6 -- Amazon plans to invest $200 billion in AI and infrastructure.

The online retail firm has become the latest tech giant to announce plans for a sharp rise in AI spending.

Andy Jassy, Amazon's chief executive, said as the company announced the latest financial results: "It's an unusual opportunity.

"I passionately believe every customer experience we have today will be reinvented by AI. We're going to invest aggressively."

The announcement actually prompted a drop in Amazon's share price, with Mary Therese Barton, chief investment officer at Pictet Asset Management, explaining that the news prompted "jitters" on Wall Street.

She told the BBC: "It has definitely been a bit of a rupture and a bit of a wake up cal...