SEMMLER Willi Competition, monopoly and differential profit rates On the relevance of the classical and Marxian theories of production prices for modern industrial and corporate pricing - New York Columbia university press 1984 - xii,238p. cm. Appendix : 197-215p. ISBN: 0231056176 Source: General Book Dewey Class. No.: X:517-75.5.N85, M4/SC