Demand is a buyer's willingness and ability to pay a price for a specific quantity of a good or service. Demand refers to how much quantity of a product or service is desired by buyers at various prices.
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- The economist’s “demand” is not the real demand; his “consumption” is an artificial consumption. For the economist, only that person really demands, only that person is a real consumer, who has an equivalent to offer for what he receives.
- Friedrich Engels, Outlines of a Critique of Political Economy (1844)