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Law of demand

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==Levels of operation of the law==
Conceptually, the law of demand arises from two fundamental causes: first, the limited purchasing power of an individual or household, and second, the fact that the nature of preferences of the individual or household, i.e., the nature of the utility function that the individual or household is trying to maximize. The law of demand operates at multiple levels.
* ''For a given household and a given commodity'': The demand of a particular household for a particular commodity is expected to increase, or at least stay constant, as the price of the commodity falls. This relies on the assumption that the marginal benefit from every additional unit of the commodity is decreasing. There are two effects responsible for the law of demand: [[income effect]], which states that the higher the price, the less the household can spend on the good with the limited income it has, and the [[substitution effect]], which predicts that an increase in price makes the household substitute away from the good towards [[subsitute goods]]. {{further|[[Law of demand for individual buyers follows from diminishing marginal utility]], [[Income effect explains law of demand]], [[substitution effect explains law of demand]]}}
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