A demand curve indicating the reverse connection between the price of the commodity and its quantity demanded by consumers is plotted on a graph wherein the prices of commodities are taken on its vertical axis and the quantity demanded by consumers is taken on the horizontal axis.

The list of determinants that may influence the Individual consumer decision to demand a particular commodity or set of commodities may include the own price of a commodity and determinants other than the commodity's own price. These factors are the consumer's income, the number of buyers, future expectations, and taste & preferences of the consumer, complementary products and services, and substitute products and services.

The demand is a function of price and the law of demand establishes an inverse relationship between the quantity demanded and the price of a product. If there is a decline in the price of a product then there will be an increase in its quantity demanded according to the law of demand and if there is an increment in the price of a product then there will be a decrease in its quantity demanded according to the law of demand. This is how the quantity demanded of a commodity gets influenced by price changes.