Twitter CEO Jack Dorsey warns of 'hyperinflation'

"Hyperinflation is going to change everything. It’s happening," Jack Dorsey tweets.

"It will happen in the US soon, and so the world," Dorsey replies to response.

To another reply he says that it is ""Not a wish. Nor do I think it’s positive at all."

Inflation is one of the biggest concerns for the economic recovery and the stock market. The Federal Reserve has shifted its strategy to allow higher inflation for longer to recover (flexible average inflation targeting, or FAIT).

The FOMC has argued that the recent spikes, with core CPI at 4% year-on-year, are transitory, but Fed chief Jay Powell said this week they could last well into next year.

Five-year breakeven inflation expectations, the ones closest to the fed funds rate, are now close to all-time highs at 2.91%.

But with all the concerns about price rises, nobody has talked about hyperinflation in developed markets.