From The Guardian: "The Economist’s recent commercial success and stellar circulation growth would be the envy of any title. Like its rival British-based periodicals, the Spectator and the New Statesman, it sold between 50,000 and 70,000 copies a week until the late Seventies, when global expansion catapulted it into a different league. It now shifts more than 1.2 million copies in 201 countries (just under 173,000 are sold in the UK) and the business made a pre-tax profit of £49m this year, a 59 per cent rise. So much for the effect of the internet and the corresponding decline of the printed word."
John Micklethwait, the Economist’s editor, provides his reasons in the Guardian (actually Observer) article at the link.