Investors are on guard for signals that demand for artificial intelligence is tailing off or that the massive spending is not paying off as anticipated.

Investments in AI, which have outstripped government-led initiatives like the Manhattan Project and the Apollo program, are reshaping global technology and drawing markets’ focus to a handful of behemoth companies, but they also create risks of a financial bubble.

Here is a list of industry executives, economists, investors and analysts’ takes on the topic:

MORTEN WIEROD, CEO OF ABB

“I don’t think there is a bubble, but we do see some constraints in terms of construction capacity not keeping up with all the new investments,” Wierod told Reuters on October 16.

“We are talking about trillions in investment,” he said. “That will take a f

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