Investment: the study of an economic aggregate / Philip J. Lund. Lund, P. J. (Philip John), 1942- Investments. HG4539 .L85 332.6 LUI Based on the author's thesis, University of Manchester. Includes indexes. Bibliography: p. 153-160. Edinburgh : Holden Day, 1971. 1971. 1971 Text vii, 167 p. : eng Mathematical economics texts ; 7