Many politicians believe they can intervene in the economy to improve people's lives. But can they? In a social experiment carried out in the United Kingdom, extensive in-work support was randomly assigned among 16,000 disadvantaged people. We follow a sub-sample of 3,500 single parents for 5...

This paper argues - in line with the proposals of the recent Stiglitz Commission on the Measurement of Economic Performance and Social Progress - that we should now be measuring a nation's emotional prosperity rather than its economic prosperity (that is, we ought to focus on the level of mental...