http://www.arrunada.org/default.aspx

Most of Arruñada's current research analyzes the institutional bases that make firms and markets possible: from the most concrete, such as property titling and business regulation, to some of the most abstract, such as moral systems. Using various methods, from case analysis to mathematical and econometric models, this research aims to discover the organizational conditions that facilitate impersonal exchange, the best means for specializing resources and speeding up economic growth.

Currently, he serves as editor for the Journal of Institutional Economics and Journal of Globalization, Competitiveness and Governability. He is a member of the editorial board of the European Journal of Law and Economics and Review of Law and Economics, of the scientific committee of Universia Business Review and of the Board of Directors of the  European School on New Institutional Economics.