How Do Markets Work ?

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How Do Markets Work ?

Explain what is implied by the assumption that decision-makers are

rational. To what extent is it sensible to think of decisions about

marriage and divorce as rational decisions ?

Economic theory has a tough job. It is essentially trying to distil

the complexities of thousands of thought processes, all types of

transactions and other various decisions we make every day that are

all effected by innumerable variables, into easy to understand, bite

sized pieces of individual theory. Surely it can be forgiven then, for

eliminating one small variable, namely the rationality of the

decision-maker, that you and I take for granted every day. This much

is true, that very little economic theory does not take the rational

behaviour of the consumer as a given and even less would be able to

function effectively without this being so. The question here

challenges us to explore the validity of the claim of unquestionable

consumer rationality and what it actually means when we take for

granted that everyone would always act in a rational manner. What are

the implications for the applicability of economic theory, should the

assumption of economists prove to be incorrect, or indeed if it is

completely true ? I will attempt to explore the implications of this

assumption using examples of where it is a key part of the workings of

economic theory, where a point in the mechanics of a theory arises

when the truth or otherwise of the assumption of consumer rationality.

An example that the question suggests is that of marriage, and if it

is appropriate to claim that such a step can be considered rational

course of action given the factors influencing the decision and surely

in this context, the economic consequences in addition to this.

It follows then that the implications of the assumption that all

decision-makers are rational are multiple for economic theory. Basic

supply and demand, and the subsequent equilibrium that characterises

market economics has at its heart, consumers making rational

decisions. The theory suggests that the price of goods tend to

equilibrium because consumers act rationally. If the price of a good

is below its equilibrium price, it is likely that many consumers will

decide that they will derive more utils from the consumption of that

good than from the consumption of any other good they could buy at the

same price. They would derive more satisfaction from that good than

the opportunity cost buying it. Conversely, should the price be above

the equilibrium, supply and demand is telling us that this is because

consumers are rationally asserting that the opportunity cost of

purchase is more than the satisfaction to be gained from it.

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