The effect of unemployment benefit generosity on unemployment duration : quasi-experimental evidence from Slovenia / Matija Vodopivec (International school for social and business studies, Celje), Suzana Laporšek (University of Primorska), Primož Dolenc (University of Primorska), Milan Vodopivec (University of Primorska, International school for social and business studies, Celje and IZA). Bonn : IZA, 2015