“…However, the emergence of lowest-low fertility in the early 1990s in Southern Europe, the region with less diversified family forms, questioned the initial assumption of convergence (Billari and Wilson 2001), led to a re-evaluation of the main theories of fertility (Kertzer et al 2006), and strengthened the view of path dependency (Blossfeld 2003). In order to explain the "paradox" of lowest-low fertility coexisting with traditional family patterns in Southern Europe (Dalla Zuanna and Micheli 2004), some scholars have emphasized socioeconomic barriers to union formation, such as high youth unemployment (Ahn and Mira 2001), increasing uncertainty linked to unstable job positions (Simó et al 2005), and tight housing markets (Holdsworth and Irazoqui 2002). Other scholars have focused on the institutional barriers to union formation, such as the familism embedded in the welfare system -which presumes that the family is primarily responsible for the well-being of its members-, and the lack of specific public policies directed at young adults, which reinforce their dependency on the family (Esping-Andersen 1999, Jurado Guerrero and Naldini 1996).…”