This book aims to tackle the issues that are central to understanding and addressing one of the most important employment policy problems facing governments in the UK and beyond: the high number of people of working age claiming 'disability' or 'incapacity' benefits.

The matching method for treatment evaluation does not balance selective unobserved differences between treated and non-treated. We derive a simple correction term if there is an instrument that shifts the treatment probability to zero in specific cases. Policies with eligibility restrictions,...