1.2.1.8 Elasticity of demand

Elasticity of demand is a concept in economics that measures the responsiveness of the quantity demanded of a good or service to changes in its price or other influencing factors. It quantifies how sensitive consumers are to changes in price and provides valuable insights into market behavior. The concept of elasticity of demand helps businesses and policymakers make decisions related to pricing, revenue, and taxation. There are various types of demand elasticity, but the most common one is Price Elasticity of Demand (PED).

Price Elasticity of Demand (PED): Price Elasticity of Demand (PED) measures the percentage change in quantity demanded in response to a percentage change in the price of a good. It indicates how much the quantity demanded of a product will change when its price changes. The formula for PED is:

PED = (% Change in Quantity Demanded) / (% Change in Price)

The value of PED can be classified into three categories:

1. Elastic Demand (PED > 1): If the absolute value of PED is greater than 1, the demand is considered elastic. This means that the quantity demanded is highly responsive to changes in price. A small change in price will result in a proportionally larger change in quantity demanded. In elastic demand, consumers are relatively price-sensitive, and price changes can significantly impact total revenue.
2. Inelastic Demand (0 < PED < 1): If the absolute value of PED is less than 1, the demand is considered inelastic. This indicates that the quantity demanded is less responsive to changes in price. Even if the price changes, the quantity demanded changes proportionally less. In inelastic demand, consumers are relatively price-insensitive, and price changes have a relatively smaller impact on total revenue.
3. Unitary Elastic Demand (PED = 1): If the absolute value of PED is exactly 1, the demand is unitary elastic. This means that the percentage change in quantity demanded is equal to the percentage change in price. Total revenue remains constant when price changes because the impact on quantity demanded offsets the change in price.

Factors Affecting PED: The price elasticity of demand is influenced by several factors, including:

• Availability of substitutes: Goods with close substitutes tend to have more elastic demand as consumers can easily switch to alternatives in response to price changes.
• Necessity vs. luxury goods: Necessities tend to have more inelastic demand because consumers may be less responsive to price changes when it comes to essential items.
• Time horizon: Demand elasticity may change over time. In the short run, demand may be more inelastic, while in the long run, consumers may have more options to adjust their behavior, leading to a more elastic response.