Key points are not available for this paper at this time.
I. Introduction, 25.--II. The basic model, 27.--III. Determination of the level of investment in a mean variance model, 32.--IV. Choice of technique, 47.--V. Remarks on alternative models of market equilibrium, 52.--VI. Concluding remarks, 55.--Appendix, 57.
J. E. Stiglitz (Tue,) studied this question.