How is the law of demand graphically demonstrated

A vertical demand curve indicates that the quantity demanded remains constant regardless of price changes, which contradicts the law of demand. This scenario describes perfectly inelastic demand, where consumers will buy the same amount regardless of price, failing to demonstrate the inverse relationship between price and quantity demanded.

An upward-sloping demand curve suggests that as prices increase, the quantity demanded also increases, which is contrary to the law of demand. This depiction is typically associated with Giffen goods or Veblen goods, where higher prices may lead to increased demand, but such cases are exceptions rather than the rule.

A horizontal demand curve indicates perfectly elastic demand, where consumers will only buy at one specific price and none at any other price. While it reflects extreme sensitivity to price changes, it does not illustrate the general principle of the law of demand, which involves a more gradual relationship between price and quantity demanded.