The availability of close substitutes significantly influences the price elasticity of demand.

Elastic Demand in the Presence of Substitutes: The presence of substitutes provides consumers with options to switch if the price of their preferred product increases. This availability makes the demand for the original product more elastic as the ease of switching heavily influences consumer decisions. Consumers tend to prioritize economic options, especially when the substitutes meet their needs similarly.

Example: In the pharmaceutical industry, when generic drugs are available alongside branded ones, a price hike for the branded medication often leads consumers to opt for the more affordable generic alternatives.

Inelastic Demand in the Absence of Substitutes: In markets where substitutes are scarce or non-existent, demand becomes inelastic. Consumers have little choice but to accept price increases.

Example: Utility services in many areas do not have direct substitutes. Consequently, even if prices for electricity or water services increase, consumers continue to use these services, reflecting inelastic demand.

Understanding the dynamics of price elasticity of demand not only guides consumer choices in a competitive market but also shapes the pricing strategies of suppliers.