This volumes examines the interaction of labour market conditions and retirement decisions. Based on French and US data, it provides empirical evidence and quantitative analysis of retirement and labor market flows. It studies the horizon effect and uses French individual data and probit models to show that the horizon effect does matter for the probability of being employed before the early retirement age. It analyses the influence of the retirement age on labour-market equilibrium, as well as the impact of labour market conditions, especially the importance of unemployment risk, on retirement decisions.