The cash to match the prime minister’s ambition will have to come from other budgets long before any benefits are seen

Keir Starmer made two predictions at the start of his week. He said that artificial intelligence will transform Britain’s economy in the coming years and that Rachel Reeves will continue to run the Treasury. Those were safe bets, but not guarantees. One is a forecast the prime minister makes eagerly, the other was bullied out of him. He would have preferred to talk about AI improving productivity, generating jobs and improving services, without being asked if he plans to sack the chancellor.

He doesn’t, and wouldn’t say even if he did. The question isn’t serious. It is a contrivance, a lobby ritual for turning speculation into news. Demand official comment on an improbable scenario, then interrogate the answer until it surrenders a headline. Starmer isn’t poised to jettison Reeves, but economic pressure on the pair is real. There is no growth. The pound is depreciating and debt costs are rising, gobbling resources that can’t then be used to upgrade the public realm.

Rafael Behr is a Guardian columnist