Give an example of a continuous preference relation anda discontinuous utility function that represents the preference relation.
Question
Give an example of a continuous preference relation anda discontinuous utility function that represents the preference relation.
Solution
Sure, let's start with the continuous preference relation.
A continuous preference relation is one where small changes in the goods do not lead to a change in the preference ranking. For example, consider a consumer who prefers more of good X to less, regardless of the amount of good Y they have. This can be represented by the preference relation U(X,Y) = X. This is continuous because a small increase in X will increase U, but will not change the consumer's ranking of bundles of goods.
Now, let's move on to the discontinuous utility function.
A discontinuous utility function is one where small changes in the goods can lead to a change in the preference ranking. For example, consider a consumer who only cares about consuming good X up to a certain point, after which they prefer to consume good Y. This can be represented by the utility function U(X,Y) = min{X, Y}. This is discontinuous because a small increase in X or Y can lead to a large change in U, and thus a change in the consumer's ranking of bundles of goods. For instance, if the consumer has a bundle (X,Y) where X>Y, a small increase in Y will lead to a large increase in U, changing the consumer's preference ranking.
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