This book assesses the size, structure and evolution of the public-private wage gap in Poland - a country frequently regarded as an example of a successful transition from a centrally planned economy to a market economy. The author extensively elaborates on the issue of the selection of employment, and reviews the available studies concerning the public-private wage gap in developed and developing countries, with a particular attention to the evolution of methodology. Furthermore, the author examines recent empirical studies on the public-sector wage premium. Contrary to former research, they have provided positive estimates of the average public-sector wage premium, with significant differences in terms of employee characteristics and local labour market conditions.