The gold standard did not collapse. Governments abolished it in order to pave the way for inflation. The whole grim apparatus of oppression and coercion, policemen, customs guards, penal courts, prisons, in some countries even executioners, had to be put into action in order to destroy the gold standard.

In the world of traditional economics, it shouldn't matter whether you use an opt-in or opt-out system. So long as the costs of registering as a donor or a nondonor are low, the results should be similar. But many findings of behavioral economics show that tiny disparities in such rules can make a big difference.

Economics is a highly sophisticated field of thought that is superb at explaining to policymakers precisely why the choices they made in the past were wrong. About the future, not so much.

There's a long list of investments that governments could and should be making. There is strengthening infrastructure, such as transport and communications; there is investment in education; there is investment in families, particularly putting measures in place that free women from having to make the choice between raising a family and work.

A single currency entails a fixed interest rate, which means countries can't manage their own currency to suit their own needs. You need a variety of institutions to help nations for which the policies aren't well suited. Europe introduced the euro without providing those structures.

The more the division of labor and the application of machinery extend, the more does competition extend among the workers, the more do their wages shrink together.