This publication is part of the Bank's multiyear program to enhance its knowledge of HRH policies. The program's ultimate objective is to strengthen knowledge and capacity to collect evidence, analyse, and evaluate the effectiveness of HRH interventions in the context of a country's health system strengthening strategy. It specifically addresses the theoretical and empirical evidence on health labour markets in low- and middle-income countries. Health labour market analysis has much to contribute to resolving globally widespread HRH problems, and their continuing neglect provides some explanation for their persistence. Policy makers in countries promulgating or refining strategies for achieving universal health coverage will find it important to understand how key elements in their health labour market are likely to interact and how these interactions could help - or hinder - progress toward universal health coverage. These interactions are complex and multidimensional, and this publication highlights some areas where forces in the health labour market matter most. The purpose of this publication is to provide an overview of the key issues when attempting to apply economics to the analysis of health workers' labour markets. Though much has been written and planned about health human resources, a major weakness with most of this analysis is that it does not use an economic perspective. The use of an explicit economic framework applied by trained economists moves the focus away from simplistic but costly policy responses such as training more doctors and nurses, toward understanding more carefully the role of incentives, productivity, and the distribution of health workers. The health workforce is but one part of the health system and a focus of analysis on only the health workforce is insufficient to be able to determine the optimal number of health workers. Market forces cannot be relied upon to solve health worker shortages or mal-distribution, due to well recognized market failures in health care. This also has implications for how labour economics and labour market analysis can be applied and used successfully in the health care sector.