The number of people claiming incapacity benefits increased rapidly to the mid 1990s, and has hardly reduced since then. This paper uses survey data to plot trends over time in the prevalence of disability, and in the employment rates of disabled people, in a way which is independent of, but...

This paper presents evidence from a field experiment, which aims to identify the two sources of worker's pro-social motivation that have been considered in the literature: action-oriented altruism and output-oriented altruism. To this end we employ an experimental design that first measures the...