Document Type

Working Paper

Publication Date



Competition laws have become a mainstay of regulation in market economies today. At the same time, past efforts to study the drivers or effects of these laws have been hampered by the lack of systematic measures of these laws across a wide range of years or countries. In this paper, we draw on new data on the evolution of competition laws to create a novel Competition Law Index (the “CLI”) that measures the stringency of competition regulation from 1889 to 2010. We then employ the CLI to examine trends in the intensity of competition regulation over time and across key countries. We also use our data to create several alternative indexes of competition law that may be appropriate for specific research applications. In doing so, we hope to demonstrate how the CLI can facilitate new empirical research on comparative and international competition law.


Antitrust and Trade Regulation | Comparative and Foreign Law | Law