Using a mix of quantitative methods and case study research, this book critically assesses the impact of party governments in different institutional settings on welfare state generosity and labour market reforms. Its key findings contradict earlier established views on the impact of leftist governments on welfare state policies. Specifically, left-wing governments are pursuing clientelistic policies when facing high institutional constraints and austerity and turn out to cater towards the core workforce rather than designing policies for the full range of labour market participants.