income effect
income effect
the change in CONSUMERS’ real INCOME resulting from a change in product PRICES. A fall in the price of a good normally results in more of it being demanded (see THEORY OF DEMAND). A part of this increase is due to the real income effect (i.e. income adjusted for changes in prices to reflect current purchasing power). If a consumer has a money income of, say, £10 and the price of good X is £1, he can buy 10 units of the product; if the price of good X now falls to 50 pence, he can buy the same 10 units for only £5. The consumer now has an ‘extra’ £5 to spend on buying more of good X and other goods. The income effect, together with the SUBSTITUTION EFFECT, provides an explanation of why DEMAND CURVES are usually downward sloping. See CONSUMER EQUILIBRIUM, REVEALED PREFERENCE, PRICE EFFECT.See INCOME-ELASTICITY OF DEMAND.