Mafias and firms / Jaime Arellano-Bover (Yale University, IZA and CESifo), Marco De Simoni (UIF and Bank of Italy), Luigi Guiso (EIEF), Rocco Macchiavello (LSE, CEPR, BREAD and J-PAL), Domenico J. Marchetti (UIF and Bank of Italy), Mounu Prem (EIEF and CEPR) ; IZA Institute of Labor Economics