In this comprehensive study of factor market concentrations, a beginning has been made in the direction of filling the gap in the knowledge of factors of production for markets in the area of labor. The author examines theories of concentration and monopsony in this study. Originally published in 1962. A UNC Press Enduring Edition -- UNC Press Enduring Editions use the latest in digital technology to make available again books from our distinguished backlist that were previously out of print. These editions are published unaltered from the original, and are presented in affordable paperback formats, bringing readers both historical and cultural value.