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Lecture Investment analysis & portfolio management - Chapter 23
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The expectation can now be employed to evaluate the expected return on an asset and a portfolio. This is achieved by introducing the idea of states of the world. A state of the world summarizes all the information that is relevant for the future return of an asset, so the set of states describes all the possible different future financial environments that may arise. Of course, only one of these states will actually be realized. These states of the world are the analysts way of thinking about, and modelling, what generates the randomness in asset returns. | Lecture Investment analysis portfolio management - Chapter 23