Postprint version. Published in Journal of Economics and Business, Volume 36, Issue 2, May 1, 1984, pages 289-290. Copyright © 1984 Elsevier. The definitive version is available at http://dx.doi.org/10.1016/0148-6195(84)90040-7.
NOTE: At the time of publication, the author Michael L. Marlow was not yet affiliated with Cal Poly.