The Capital Asset Pricing Model (CAPM), an equilibrium model for the price determination of risky assets, was developed by Sharpe [16], Lintner [9, 10] and Treynor [21], following the pioneering work of Markowitz [12, 13] and Tobin [20]. In spite of the tremendous impact of this model on the profession, the CAPM still raises many questions, and is inconsistent with a considerable body of empirical evidence.

Studies which deal with portfolio efficiency analysis can be divided into two main categories: (a) those concerned with the development of normative decision rules; and (b) those that discuss the application of the normative rules to empirical data. Most of the research on portfolio efficiency analysis uses some set of empirical data, without considering the possible errors which may arise when a sample rather than the entire population is examined. The prevailing neglect of the sampling errors is a clear reflection of the complexity of the issue.

The decomposition of a security risk into diversifiable (or unsystematic) and nondiversifiable (or systematic) risks has emerged from the portfolio approach of capital investment and has culminated in the well-known Capital Asset Pricing Model (CAPM), developed by Sharpe [4], Lintner [3] and others. In this framework, the diversifiable risk is the risk that can be “washed out” by diversification and the nondiversifiable risk is the risk which cannot be diversified away. It appears to us that the decomposition of risk into its components is in some cases vague and in most cases imprecise. We define the diversifiable and nondiversifiable risk measures as two complementary components of the standard deviation of a security's rate of return. Furthermore, we require thatthe nondiversifiable risk measure will completely determine its equilibrium market price. We shall see that the definition presented is appealing for all securities and particularly for those with negative Beta. To be more specific, recall that a security's β is given by the slope of the following time series regression:

CAPITAL BUDGETING. The Goal of the Firm. Capital Budgeting: An Overview. The Economic Evaluation of Investment Proposals. Net Present Value Versus Internal Rate of Return. Using Cash Flows to Evaluate Investments. Traditional Measures of Investment Worth. Managing Working Capital. RISK AND UNCERTAINTY. Foundations of Risk Analysis. Measuring Risk. Applications of Risk Analysis. Decreasing Risk by Diversification: The Portfolio Approach. The Capital Asset Pricing Model and Arbitrage Pricing Theory. LONG-TERM FINANCIAL DECISIONS. Financial Leverage. Capital Structure and Valuation. Bankruptcy Risk and the Choice of Financial Structure. Defining the Cost of Capital. Measuring the Cost of Capital. Dividend Policy. Options and Futures. The Lease or Buy Decision. Mergers. International Financial Management. Appendices. Index.

Itzhak Venezia, Haim Levy; Optimal Claims in Automobile Insurance, The Review of Economic Studies, Volume 47, Issue 3, 1 April 1980, Pages 539–549, https:/