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Concept
Intertemporal choice
Summary
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.
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 the future and vice versa.
The revenue is in form of interest rate.
Official source
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Hyperbolic discounting
In economics, hyperbolic discounting is a time-inconsistent model of delay discounting. It is one of the cornerstones of behavioral economics and its brain-basis is actively being studied by neuroeconomics researchers. According to the discounted utility approach, intertemporal choices are no different from other choices, except that some consequences are delayed and hence must be anticipated and discounted (i.e., reweighted to take into account the delay). Given two similar rewards, humans show a preference for one that arrives sooner rather than later.