Recent research on entrepreneurship by sociologists has focused on subsec- tors of the discipline rather than on entrepreneurship as a class. This review draws insights from diverse literatures to develop a sociological perspective on entrepreneurship as a whole. Until recently, the supply-side perspective, which focuses on the individual traits of entrepreneurs, has been the domi- nant school of research. Newer work from the demand-side perspective has focused on rates, or the context in which entrepreneurship occurs. This re- view emphasizes this less developed demand-side perspectiveóin particu- lar, the influence of firms and markets on how, where, and why new enter- prises are founded. I take stock of the differences and separation in the two perspectives and argue that sociological frameworks, an embeddedness per- spective, institutional and ecological theory, and multilevel models can be used to integrate the two schools and extend their research implications.