Intertemporal choice

Intertemporal choice is the study of the relative value people assign to two or more payoffs at different points in time. This relationship is usually simplified to today and some future date. Intertemporal choice was introduced by John Rae in 1834 in the "Sociological Theory of Capital". Later, Eugen von Böhm-Bawerk in 1889 and Irving Fisher in 1930 elaborated on the model. Fisher model Assumptions of the model

consumer's income is constant

maximization of the utility

anything above the line is out of explanation

investments are generators of savings

any property is indivisible and unchangeable

According to this model there are three types of consumption: past, present and future. When making decisions between present and future consumption, the consumer takes his/her previous consumption into account. This decision making is based on an indifference map with negative slope because if he consumes something today it means that he can't consume it in th
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