Models of return generation for securities are potentially important for a number of reasons, including their possible utility in normative portfolio construction. Multi-index models of the process are frequently suggested as an alternative to the familiar single-index models, but, while the multi-index models are intuitively appealing, their empirical superiority remains largely undemonstrated. This paper examines the extent to which three multi-index models succeed in eliminating dependence in the return residuals for a portfolio of common stocks. The relevance of this research lies in the promise that, while obviously requiring additional inputs to determine the efficient set of portfolios, multi-index models may succeed in identifying a more accurate set of efficient portfolios.

Journal Article Reaction Functions as Nash Equilibria Get access James W. Friedman James W. Friedman University of Rochester Search for other works by this author on: Oxford Academic Google Scholar The Review of Economic Studies, Volume 43, Issue 1, February 1976, Pages 83–90, https://doi.org/10.2307/2296602 Published: 01 February 1976 Article history Received: 01 January 1974 Accepted: 01 April 1975 Published: 01 February 1976

Numerical approximations are presented for the expected utility of wealth over a single time period for a small investor who proportions her or his available capital between a risk-free asset and a risky stock. The stock price is assumed to be a log-stable random variable. The utility functional is logarithmic or isoeleastic (yaq, q extless 0). Analytic results are presented for special choices of model parameters, and for large and small time periods.

Recent advances in the general equilibrium pricing of simple put and call options lay the foundation for the development of a general theory of the valuation of contingent claims assets. This paper provides a review of: (1) the development of the general equilibrium option pricing model by Black and Scholes, and the subsequent modifications of this model by Merton and others; (2) the empirical verification of these models; and (3) applications of these models to value other contingent claim assets such as the debt and equity of a levered firm and dual purpose mutual funds.

[This paper is concerned with Fisher's tests for index numbers. In particular, uniqueness and inconsistency theorems are proved. Beyond that, Fisher's system of tests is weakened considerably. Without any regularity assumption (such as differentiability or continuity) it is shown that every subset of the system of weakened tests is consistent while the whole system is inconsistent. The question of how far the whole system must be weakened to obtain a consistent set of tests is also considered.]

Segment reporting, Disaggregation, Informational content

This paper concerns utility functions for money. A measure of risk aversion in the small, the risk premium or insurance premium for an arbitrary risk, and a natural concept of decreasing risk aversion are discussed and related to one another. Risks are also considered as a proportion of total assets.

[Support prices are derived for weakly maximal paths in an optimal growth model which is time dependent but without uncertainty. The notion of "reachable" stocks and paths is defined and used to derive turnpike theorems by the value loss method. The proofs do not depend on the presence of optimal balanced paths nor on the usual transversality conditions. The theorems are extended to the classical model which has a non-trivial von Neumann facet.]