In economics and consumer theory, a linear utility function is a function of the form: or, in vector form: where:
* is the number of different goods in the economy.
* is a vector of size that represents a bundle. The element represents the amount of good in the bundle.
* is a vector of size that represents the subjective preferences of the consumer. The element represents the relative value that the consumer assigns to good . If , this means that the consumer thinks that product is totally worthless. The higher is, the more valuable a unit of this product is for the consumer.
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| - In economics and consumer theory, a linear utility function is a function of the form: or, in vector form: where:
* is the number of different goods in the economy.
* is a vector of size that represents a bundle. The element represents the amount of good in the bundle.
* is a vector of size that represents the subjective preferences of the consumer. The element represents the relative value that the consumer assigns to good . If , this means that the consumer thinks that product is totally worthless. The higher is, the more valuable a unit of this product is for the consumer. (en)
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| - In economics and consumer theory, a linear utility function is a function of the form: or, in vector form: where:
* is the number of different goods in the economy.
* is a vector of size that represents a bundle. The element represents the amount of good in the bundle.
* is a vector of size that represents the subjective preferences of the consumer. The element represents the relative value that the consumer assigns to good . If , this means that the consumer thinks that product is totally worthless. The higher is, the more valuable a unit of this product is for the consumer. A consumer with a linear utility function has the following properties:
* The preferences are strictly monotone: having a larger quantity of even a single good strictly increases the utility.
* The preferences are weakly convex, but not strictly convex: a mix of two equivalent bundles is equivalent to the original bundles, but not better than it.
* The marginal rate of substitution of all goods is constant. For every two goods :.
* The indifference curves are straight lines (when there are two goods) or hyperplanes (when there are more goods).
* Each demand curve (demand as a function of price) is a step function: the consumer wants to buy zero units of a good whose utility/price ratio is below the maximum, and wants to buy as many units as possible of a good whose utility/price ratio is maximum.
* The consumer regards the goods as perfect substitute goods. (en)
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