Professor of Political Economy

Sant’Anna School of Advanced Studies, Pisa
International Chief Economist - Centro Europa Ricerche (CER), Roma
London School of Economics and Political Sciences (LSE)
European Institute



Memorial for Judith Collignon
(details in the Pdf)







  • P. Esposito, S. Collignon, S. Scicchitano: Immigration And Unemployment In Europe - Does The Core-Periphery Dualism Matter? Working paper 3/2019, School of European Political Economy LUISS, March 2019. (Download in PDF)

    : In this paper, we assess the relation between immigration and unemployment for a sample of 15 EU countries between 1997 and 2016. We estimate separate effects for Northern and Southern Countries based on the differences between the two groups in terms of skill intensity and flexibility of labour market adjustments. We use a panel Error Correction Model to assess the direction and persistence of the impact of immigration on domestic unemployment in the short and in the long run. In the long run, immigration is found to reduce unemployment in all peripheral-countries. In core countries, on average there is no long-run impact of immigration on unemployment due to a substantial heterogeneity, but country specific estimates provide evidence that immigration might have reduced unemployment in France, Germany and the UK. As for short-run dynamics, for the EU15 as a whole we find a confirmation of the result that immigration reduces unemployment, while the evidence of a core-periphery dualism is less pronounced.

  • Negative and positive liberty and the freedom to choose in Isaiah Berlin and Jean-Jacques Rousseau. In: The journal of philosophical economics: reflections on economic and social issue, Vol. XII Issue 1, Autumn 2018.
    Abstract : Berlin has made the famous distinction between negative and positive liberty. For many liberals, negative liberty is modern individual liberty manifested in markets, while interference by the State is a form of positive liberty. Berlin was also repelled by Rousseau’s concept of the general will, which he considered as a form of collectivist holism. The paper argues that this philosophy is a mistaken interpretation of Berlin’s two concepts of liberty and of Rousseau’s general will. In a simple model of individual and collective choice under conditions of bounded rationality, it is shown that positive and negative liberty are interdependent. The collective choices made under positive liberty can be modeled as the stochastic version of Rousseau’s general will, provided that liberal democracy enables the conditions of free public deliberation. In that case, the individual freedom cherished by Berlin is compatible with positive liberty.

  • Stefan Collignon, Stefano Fantacone, Antonio Forte, Chiara Guerello, Re-inventing Europe, Centro Europa Ricerche (CER), rapporto 1, 2018.

  • New "rapporto", Centro Europa Ricerche (CER), coming soon.




  • I have presented this paper in a working seminar at the ECB (12.04.2018). Download here in Pdf (Submitted to review) - in Pptx

  • Wage Imbalances in the European Labour Market. In : Leila Simona Talani (ed.), Europe in Crisis : A structural analysis, Palgrave Macmillan, 2016.
  • Stefan Collignon and Piero Esposito. Wage Competitiveness in Luxembourg. A Study engaged by the Government of the Grand Dutchy of Luxembourg In respect of the Project Wage Imbalances in the European Labour Market. London, 29 September 2016. LSE consulting.