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April 13, 2026 

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INCOME ELASTICITY OF DEMAND: The relative response of a change in demand to a relative change in income. More specifically the income elasticity of demand can be defined as the percentage change in demand due to a percentage change in buyers' income. The income elasticity of demand quantitatively identifies the theoretical relationship between income and demand.

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PERFECT COMPETITION AND EFFICIENCY: Perfect competition is the idealized market structure that achieves an efficient allocation of resources. The conditions of perfect competition, including (1) large number of small firms, (2) identical products sold by all firms, (3) freedom of entry into and exit out of the industry, and (4) perfect knowledge of prices and technology, ensure that perfect competition efficiently allocates resources. This is in fact the purpose of perfect competition: a market structure that illustrates perfection, the best of all possible resource allocation worlds. The real world falls short of this perfection.

     See also | perfect competition | efficiency | market structure | resource allocation | imperfect competition | monopoly | oligopoly | monopolistic competition |


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RULE OF CONSUMER EQUILIBRIUM

A condition of consumer equilibrium and utility maximization stating that the marginal utility-price ratios for all goods are equal. This rule is a handy way of checking for consumer equilibrium and utility maximization. If the rule is not satisfied, then consumer equilibrium and utility maximization are not achieved.

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Today, you are likely to spend a great deal of time at a flea market wanting to buy either a really, really exciting, action-filled video game or a coffee cup commemorating the moon landing. Be on the lookout for bottles of barbeque sauce that act TOO innocent.
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