Communication to the Editor—A Note on “Mathematical Analysis of Rates of Return Under Certainty”

In this note a new approach to the rate of return problem is taken in two stimulating articles by Daniel Teichroew, Alexander A. Robichek and Michael Montolbano [Teichroew, D., A. Robichek, M. Montalbano. 1965. Mathematical analysis of rates of return under certainty. Management Sci.11 (3, January)] and [Teichroew, D., A. Robichek, M. Montalbano. 1965. An analysis of criteria for investment and financing under certainty. Management Sci.12 (3, November)]. One of these results, given as theorem II A in the first article, is, however, partly in error.