%0 Journal Article %T Optimal taxation and monitoring in an economy with matching frictions and underground activities %A Gaetano LISI %J Eastern Journal of European Studies %D 2011 %I Alexandru Ioan Cuza University of Iasi %X This short paper shows the interdependence of taxation and monitoring policy in a search and matching model of equilibrium unemployment with an underground sector. More precisely, from a social welfare standpoint, two options are available to the policy maker: she/he may either substitute a tighter monitoring with a higher penalty or enforce both a higher taxation and an increased monitoring. %K optimal taxation %K tax evasion %K underground economy %K job search %U http://www.ejes.uaic.ro/articles/EJES2011_0201_LIS.pdf