The slide came as trading opened in Asia and Australia on Monday, extending a 2.6% dive from Friday — and spurring predictions the pound could plunge to parity with the US dollar in the coming months.
“We have to unleash the power of the private sector,” Kwarteng said.
Former Tory chancellor Lord Ken Clarke criticized the tax cuts on Sunday, saying it could lead to the collapse of the pound.
“I’m afraid that’s the kind of thing that’s usually tried in Latin American countries without success,” Clarke said in an interview with BBC radio.
The pound has been hammered by a string of weak economic data, but also the steep ascent of the US dollar, a safe haven investment that sees inflows in times of uncertainty.
But the economic outlook in the UK means the pound is suffering more than most, in the face of a disastrous energy crunch and the highest inflation among G7 nations.
The previous record low for the British pound against the US dollar was 37 years ago on February 25, 1985, when 1 pound was worth $1.054.