Paul Krugman: Taxing the Speculators

Should we use taxes to deter financial speculation? Yes, say top British officials, who oversee the City of London, one of the world’s two great banking centers. Other European governments agree — and they’re right.

Unfortunately, United States officials — especially Timothy Geithner, the Treasury secretary — are dead set against the proposal. Let’s hope they reconsider: a financial transactions tax is an idea whose time has come.

The dispute began back in August, when Adair Turner, Britain’s top financial regulator, called for a tax on financial transactions as a way to discourage “socially useless” activities. Gordon Brown, the British prime minister, picked up on his proposal, which he presented at the Group of 20 meeting of leading economies this month.

Why is this a good idea? The Turner-Brown proposal is a modern version of an idea originally floated in 1972 by the late James Tobin, the Nobel-winning Yale economist. Tobin argued that currency speculation — money moving internationally to bet on fluctuations in exchange rates — was having a disruptive effect on the world economy. To reduce these disruptions, he called for a small tax on every exchange of currencies.