Anno 125 - Vol. 71 - N. 1 October 2012 GIORNALE DEGLI ECONOMISTI E ANNALI DI ECONOMIA SPECIAL ISSUE PAPERS FROM THE XXII SIEP ANNUAL CONFERENCE INTRODUCTION M. Bordignon, E. Granaglia, D. Monacelli MATTHEW EFFECTS AND R&D SUBSIDIES: KNOWLEDGE CUMULABILITY IN HIGH-TECH AND LOW-TECH INDUSTRIES 1 C. Antonelli, F. Crespi 5 THE STRENGTHS AND FAILURES OF INCENTIVE MECHANISMS IN NOTIONAL DEFINED CONTRIBUTION PENSION SYSTEMS A. Marano, C. Mazzaferro, M. Morciano 33 EUROPEAN EMISSION TRADING SCHEME AND ENVIRONMENTAL INNOVATION: AN EMPIRICAL ANALYSIS USING CIS DATA FOR ITALY S. Borghesi, G. Cainelli, M. Mazzanti 71