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Depending on its elasticity, a good is said to have elastic demand (> 1), inelastic demand (< 1), or unitary elastic demand (= 1). If demand is elastic, the quantity demanded is very sensitive to price, e.g. when a 1% rise in price generates a 10% decrease in quantity.
If price elasticity of demand is calculated to be less than 1, the good is said to be inelastic. An inelastic good will respond less than proportionally to a change in price; for example, a price increase of 40% that results in a decrease in demand of 10%. Goods that are inelastic often have at least one of the following characteristics:
The elasticity of demand usually will vary depending on the price. If the demand curve is linear, demand is inelastic at high prices and elastic at low prices, with unitary elasticity somewhere in between. There does exist a family of demand curves with constant elasticity for all prices.
If demand changes by less than the change in price or income, it has inelastic demand. Economists use elasticity of demand to gauge how responsive consumers are to changes in price and income, but ...
Total revenue, the product price times the quantity of the product demanded, can be represented at an initial point by a rectangle with corners at the following four points on the demand graph: price (P 1), quantity demanded (Q 1), point A on the demand curve, and the origin (the intersection of the price axis and the quantity axis).
Advertising can cause either a company's perceived demand curve to become more inelastic or demand for the company's product to increase. In either case, a successful advertising campaign may allow a company to sell a greater quantity or to charge a higher price, or both, and thus increase its profits. [ 24 ]
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Perfectly inelastic demand is represented by a vertical demand curve. Under perfect price inelasticity of demand, the price has no effect on the quantity demanded. The demand for the good remains the same regardless of how low or high the price. Goods with (nearly) perfectly inelastic demand are typically goods with no substitutes.