A graph relating demand for a good or service to its price. The price of the good is usually shown on the vertical axis and the quantity demanded at each level of its own price on the horizontal axis. Other factors affecting demand are assumed constant, including incomes, the prices of other goods, and other factors such as fashion and the weather. A demand curve may represent the demand of an individual consumer, or of the market as a whole. The demand curve for a good is normally downward-sloping, that is, more is demanded at a lower price. The demand curve may shift if incomes or the prices of other goods alter, or if there are changes in other factors, for example competition from new products.

See also:

compensated demand curve, downward-sloping demand curve, kinked demand curve, and market equilibrium

• import levy
• import licence
• import penetration
• import propensity
• import quota
• import restriction
• imports
• import substitution
• import surcharge
• import tariff
• imputation system
• imputed charge for consumption of non-trading capital
• imputed income
• IMRO
• incentive-compatibility
• incentives
• incidence of taxation
• income
• income approach to GDP
• income change, compensating
• income distribution
• income effect
• income elasticity of demand
• income expansion path
• income from employment