Poverty, increased inequality, and social exclusion are back on the political agenda in Western Europe, not only as a consequence of the Great Recession of 2008, but also because of a seemingly structural trend towards increased inequality in advanced industrial societies that has persisted since the 1970s. How can we explain this increase in inequalities? Policies in labor markets, social policy, and political representation are strongly linked in the creation, widening, and deepening of insider-outsider divides--a process known as dualization. While it is certainly not the only driver of increasing inequality, the encompassing nature of its development across multiple domains makes dualization one of the most important current trends affecting developed societies. However, the extent and forms of dualization vary greatly across countries. The comparative perspective of this book provides insights into why Nordic countries witness lower levels of insider-outsider divides, whereas in