Using administrative data from the state of Georgia, this paper finds that, on average, across all firms, employing undocumented workers reduces a firm’s hazard of exit by 19 percent. The advantage to firms from employing undocumented workers increases as more firms in the industry do so,...

This paper builds on previous work within the conceptual framework of a generalized Darwinism that clarifies such concepts as selection and replication. One of its aims is to refine the concept of the interactor. An overview of the conditions under which group selection may occur helps us...