Having adopted the policies of Keynes in response to a calamitous recession, the United States has grown more than twice as fast during the past three years as Britain, which adopted the economics of Hoover (and Paul Ryan).
One of the frustrations of economics is that it is hard to carry out scientific experiments and prove things beyond reasonable doubt. But not in this case. Thanks to Osborne’s stubborn refusal to change course—“Turning back would be a disaster,” he told Parliament—what has been happening in Britain amounts to a “natural experiment” to test the efficacy of austerity economics. For the sixty-odd million inhabitants of the U.K., living through it hasn’t been a pleasant experience—no university institutional-review board would have allowed this kind of brutal human experimentation. But from a historical and scientific perspective, it is an invaluable case study.