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price-consumption curve
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curve tracing the utility-maximizing combinations of two goods as the price of one changes
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individual demand curve
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curve relating to the quantity of a good that a single consumer will buy to its price
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income-consumption curve
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curve tracing the utility maximizing combinations of two goods as a consumer's income changes
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Engel curve
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cure relating the quantity of a good consumed to income
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substitution effect
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change in consumption of a good associated with a change in its price, with the level of utility held constant
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income effect
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change in consumption of a good resulting from an increase in purchasing power, with relative prices held constant
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inferior good
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a good that has a negative income effect
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Giffen good
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good whose demand curve slopes upward because the (negative) income effect is larger than the substitution effect
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market demand curve
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curve relating the quantity of a good that all consumers in a market will buy to its price
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isoelastic demand curve
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demand curve with a positive price elasticity
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speculative demand
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demand driven not by the direct benefits one obtains from owning or consuming a good but instead by an exception that the price of the good will increase
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consumer surplus
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difference between what a consumer is willing to pay for a good and the mount actually paid
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network externality
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situation in which each individual's demand depends on the purchase of other individuals
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bandwagon effect
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positive network externality in which a consumer wishes to possess a good in part because others do
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snob effect
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negative network externality in which a consumer wishes to own an exclusive or unique good