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Utility theory provides a methodological framework for the evaluation of alternative choices made by individuals, firms and organizations. Utility refers to the satisfaction that each choice provides to the decision maker. Thus, utility theory assumes that any decision is made on the basis of the utility maximization principle, according to which the best choice is the one that provides the highest utility (satisfaction) to the decision maker.
IN CONSUMER BEHAVIOR
Utility theory is often used to explain the behavior of individual consumers. In this case the consumer plays the role of the decision maker that must decide how much of each of the many different goods and services to consume so as to secure the highest possible level of total utility subject to his/her available income and the prices of the goods/services.
UTILITY THEORY AND DEMAND
In addition to providing an explanation of consumer disposition of income, utility theory is useful in establishing individual consumer demand curves for goods and services. A consumer's demand curve for a good or service shows the different quantities that consumers purchase at various alternative prices. Factors that are held constant are consumers' tastes and preferences, income, and price.
In all cases the utility that the decision maker gets from selecting a specific choice is measure by a utility function U, which is a mathematical representation of the decision maker's system of preferences such that: U(x) > U(y), where choice x is preferred over choice y or U(x) = U(y), where choice x is indifferent from choice y—both choices are equally preferred.
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