We present theory on international migration of dual-earner couples, and test it using Danish register data. Our model predicts that the probability that a couple emigrates is increasing in the earnings of the primary earner. The effect of the earnings of the secondary earner may go either way....

In many advanced economies, car use per head, and sometimes total car traffic, has shown low growth. In some countries (and especially cities) it has declined. In a few countries, there have been similar studies of the distance travelled by all modes added together, which has shown a similar...