Module 5: Elasticity - Measuring Market Sensitivity

We know that a price increase leads to a decrease in demand. However, to run a profitable business, a CEO doesn't just need to know that demand will drop; they need to know by exactly how much. Elasticity is the tool economists use to measure the responsiveness of one variable to changes in another .

1. Price Elasticity of Demand (PED)

PED measures how intensely the quantity demanded of a good responds to a change in the price.

• Inelastic (PED < 1): Quantity changes proportionally less than the price. Consumers will buy it regardless of cost (e.g., life-saving insulin, gasoline).
• Elastic (PED > 1): Quantity changes proportionally more than the price. Consumers are highly sensitive (e.g., luxury watches, a specific brand of cereal).

2. The Determinants of Elasticity

Why are some goods highly sensitive while others are not?

• Availability of Substitutes: If the price of Pepsi rises 20%, consumers easily switch to Coke (Highly Elastic). If the price of municipal water rises 20%, you cannot switch to another pipe (Highly Inelastic).
• Necessities vs. Luxuries: Medical care is inelastic; a Caribbean vacation is elastic.
• Time Horizon: Gasoline demand is inelastic in the short term (you need to drive to work tomorrow). In the long term, it becomes elastic as people buy electric vehicles or move closer to their jobs.

3. Why Elasticity Matters: The Revenue Trap

For a corporate manager, understanding elasticity is the difference between a successful price hike and a catastrophic loss of revenue.

• If demand is Inelastic, raising prices will increase total corporate revenue (the higher price compensates for the few lost customers).
• If demand is Elastic, raising prices will destroy total revenue (the massive drop in volume outweighs the higher price per unit).

Interactive Exploration: The Revenue Maximizer Step into the role of a corporate pricing strategist. Use the tool below to see how adjusting your product's price impacts your bottom line, entirely dependent on the elasticity of your customer base.

Case Study: The Netflix Subscription Hike Over the last decade, Netflix has continually raised its monthly subscription price from $8 to $15+.

• Analysis: Netflix correctly calculated that their service was relatively inelastic. Because the absolute dollar cost is low compared to the high hours of entertainment utility, and switching costs are annoying, the percentage of users who canceled (drop in Quantity) was vastly outweighed by the extra revenue generated per remaining user. Total revenue soared.

Self-Assessment Quiz

1. If an airline raises ticket prices by 10%, and ticket sales drop by 25%, is the demand for their flights considered Elastic or Inelastic?
2. If you are selling a product with a highly Elastic demand curve, what will happen to your Total Revenue if you aggressively raise your prices?