Abstract
In this chapter, we first introduce utility function and indifference curve. Based on utility theory, we derive the Markowitz’s model and the efficient frontier through the creation of efficient portfolios of varying risk and return. We also include methods of solving for the efficient frontier both graphically and mathematically, with and without explicitly incorporating short selling.
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Notes
- 1.
A cardinal utility implies that a consumer is capable of assigning to every commodity or combination of commodities a number representing the amount or degree of utility associated with it. An ordinary utility implies that a consumer needs not be able to assign numbers that represent (in arbitrary unit) the degree or amount of utility associated with commodity or combination of commodity. The consumer can only rank and order the amount or degree of utility associated with commodity.
- 2.
Technically, these conditions can be represented mathematically by ∂U ∕ ∂μ w > 0 and ∂U ∕ ∂σ w < 0.
- 3.
- 4.
By definition, an indifference curve shows all combinations of products (investments) A and B that will yield same level of satisfaction or utility to consume. This kind of analysis is based upon ordinal rather than cardinal utility theory.
- 5.
Most texts do not identify the Markowitz model with restrictions on short sale. Markowitz (1952), in fact, excluded short sales.
- 6.
See Baumol (1963).
- 7.
- 8.
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Lee, CF., Finnerty, J.E., Chen, HY. (2010). Risk-Aversion, Capital Asset Allocation, and Markowitz Portfolio-Selection Model. In: Lee, CF., Lee, A.C., Lee, J. (eds) Handbook of Quantitative Finance and Risk Management. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-77117-5_5
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DOI: https://doi.org/10.1007/978-0-387-77117-5_5
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