Although entrepreneurship has become a buzzword in the public debate, a coherent definition of entrepreneurship has not yet emerged. In this paper, we review and compare the most common theoretical definitions of entrepreneurship in economics and discuss their connection to the various empirical measures in use. We argue that entrepreneurship is best considered a multifaceted concept, and that the different empirical measures reflect different aspects of entrepreneurship. The relevance of this exercise is illustrated by the fact that in a cross-country comparison of entrepreneurship, we find that the relative ranking of countries depends crucially on the indicator used.
Defining and Measuring Entrepreneurship reviews the most common concepts of entrepreneurship from the theoretical economics literature, identifying common elements and pointing to important differences. The purpose is to compare these theoretical ideas of entrepreneurship with the measures used in empirical country-level studies. Since a coherent or unifying definition of entrepreneurship has not emerged, the authors explain that it is important to be precise about the relationship between the different theoretical aspects of entrepreneurship and the empirical measures. This is revealed by comparing entrepreneurial activity across OECD countries using measures that reflect different theoretical aspects. Based on various data sources, the relative ranking of countries is very sensitive to the empirical measure used.