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Public policy, grounded in the conception of urban transit as a private business and of the automobile as a public good, played a crucial role in the decline of public transportation and the triumph of the automobile in Chicago.
Prior to 1952 there was no analytical theory available that would satisfactorily explain the well-known phenomenon of asset diversification by investors. Although the portfolio selection criteria of Markowitz [3] and that of Roy [5] both explain diversification, they are based on very different objectives. The objective of Markowitz's approach is to select the portfolio of securities that maximizes the expected utility of the investor, i.e., the EV criterion. The objective of Roy's approach is economic survival through selection of the portfolio that minimizes the probability of disaster, i.e., the safety-first (SF) criterion.