Question

How do we determine whether the demand for a particular commodity is elastic or inelastic?

Answer 1

1. Price Elasticity of Demand (Ed): The most common way to determine elasticity is by calculating the elasticity of demand, which measures the responsiveness of the quantity demanded to a change in the commodity's price.
   1. Elastic Demand (Ed > 1): Demand is elastic if the percentage change in quantity demanded is greater than the percentage change in price. This means consumers are highly responsive to price changes.
   2. Inelastic Demand (Ed < 1): Demand is inelastic if the percentage change in quantity demanded is less than the percentage change in price. This means consumers are not very responsive to price changes.
   3. Unitary Elastic Demand (Ed = 1): If the percentage change in quantity demanded exactly equals the percentage change in price, demand is unitary elastic.
2. Total Revenue (Expenditure) Test: This method involves observing how total revenue (or total expenditure) changes in response to a price change.
   1. Elastic Demand: If a decrease in price leads to an increase in total revenue (or if an increase in price leads to a decrease in total revenue), the demand is elastic.
   2. Inelastic Demand: If a decrease in price leads to a decrease in total revenue (or if an increase in price leads to an increase in total revenue), the demand is inelastic.
   3. Unitary Elastic Demand: If total revenue remains unchanged when the price changes, the demand is unitary elastic.
3. Availability of Substitutes: If many close substitutes are available for a commodity, the demand for that commodity is likely to be elastic. Consumers can easily switch to another product if the price rises.
   1. Elastic Demand: Many close substitutes are available.
   2. Inelastic Demand: Few or no close substitutes available.
4. Necessity vs. Luxury: The nature of the commodity (whether it is a necessity or a luxury) can indicate its elasticity.
   1. Inelastic Demand: Necessities, such as food, medicine, and basic utilities, tend to have inelastic demand because consumers need these goods regardless of price changes.
   2. Elastic Demand: Luxuries like designer clothes or high-end electronics tend to have elastic demand because consumers can do without them or delay purchases when prices rise.
5. Proportion of Income Spent: The proportion of a consumer’s income spent on a good also influences its elasticity.
   1. Inelastic Demand: If a small proportion of income is spent on the good (e.g., salt, matches), the demand will likely be inelastic because price changes have little impact on the consumer’s overall budget.
   2. Elastic Demand: If a large proportion of income is spent on the good (e.g., housing, cars), the demand is more likely to be elastic.