The Prime Minister - described by the Nobel prize-winning economist Paul Krugman as the man who "saved the world financial system" - is on comfortable territory here: "I think my credentials . . . are very strong."Krugman, however, has also criticised Brown, who he says "bought fully into the dogma that the market knows best, that less regulation is more". Does the Prime Minister regret his earlier neoliberal zeal for deregulation? As Chancellor, he gave numerous speeches to banking audiences in which he extolled the virtues of "light touch" and "limited touch" regulation in the City. Despite conceding that he has "learned lessons from what has happened in the global financial crisis", he seems largely unrepentant. "We had a dynamic financial sector and we still have a dynamic financial sector," he says, adding gruffly: "We're not anti-business."