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The theory of consumer choice is the branch of microeconomics that relates preferences to consumption expenditures and to consumer demand curves. It analyzes how consumers maximize the desirability of their consumption (as measured by their preferences subject to limitations on their expenditures), by maximizing utility subject to a consumer budget constraint.[1]
Factors influencing consumers' evaluation of the utility of goods include: income level, cultural factors, product information and physio-psychological factors.
Consumption is separated from production, logically, because two different economic agents are involved. In the first case, consumption is determined by the individual. Their specific tastes or preferences determine the amount of utility they derive from goods and services they consume. In the second case, a producer has different motives to the consumer in that they are focussed on the profit they make. This is explained further by producer theory. The models that make up consumer theory are used to represent prospectively observable demand patterns for an individual buyer on the hypothesis of constrained optimization. Prominent variables used to explain the rate at which the good is purchased (demanded) are the price per unit of that good, prices of related goods, and wealth of the consumer.
The law of demand states that the rate of consumption falls as the price of the good rises, even when the consumer is monetarily compensated for the effect of the higher price; this is called the substitution effect. As the price of a good rises, consumers will substitute away from that good, choosing more of other alternatives. If no compensation for the price rise occurs, as is usual, then the decline in overall purchasing power due to the price rise leads, for most goods, to a further decline in the quantity demanded; this is called the income effect. As the wealth of the individual rises, demand for most products increases, shifting the demand curve higher at all possible prices.
In addition, people's judgments and decisions are often influenced by systemic biases or heuristics and are strongly dependent on the context in which the decisions are made, small or even unexpected changes in the decision-making environment can greatly affect their decisions.[2]
The basic problem of consumer theory takes the following inputs:
The consumption setC – the set of all bundles that the consumer could conceivably consume.
A preference relation over the bundles of C. This preference relation can be described as an ordinal utility function, describing the utility that the consumer derives from each bundle.
A price system, which is a function assigning a price to each bundle.
An initial endowment, which is a bundle from C that the consumer initially holds. The consumer can sell all or some of his initial bundle in the given prices, and can buy another bundle in the given prices. He has to decide which bundle to buy, under the given prices and budget, in order to maximize their utility.
^"What is 'consumer choice theory'? — Economy". Economy. Retrieved 2017-05-31.
^Reisch, Lucia A.; Zhao, Min (November 2017). "Behavioural economics, consumer behaviour and consumer policy: state of the art". Behavioural Public Policy. 1 (2): 190–206. doi:10.1017/bpp.2017.1. hdl:10398/01e85b29-3d75-4be3-95dc-d256ad5dd947. ISSN 2398-063X. S2CID 158160660.
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