The law of demand is a fundamental principle of economics, which states that at a higher price, consumers will demand less of a good.
Demand results from the law of diminishing marginal utility, the fact that consumers use economic goods primarily to satisfy their most pressing needs.
The market demand curve expresses the sum of the quantity demanded at each price for all consumers in the market.
Changes in price may be reflected in the movement along the demand curve, but they do not in themselves increase or decrease demand.
The shape and magnitude of demand changes in response to changes in consumer preferences, incomes, or related economic benefits, and NOT to changes in prices.