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1. Define the price elasticity of demand and the income elasticity of demand. Price elasticity of demand : The price elasticity of demand measures how much the quantity demanded responds to a change in price. Demand for a good is said to be elastic if the quantity demanded responds substantially to changes in the price. Demand is said to be inelastic if the quantity demanded responds only slightly to changes in the price. Economists compute the price elasticity of demand as the percentage change in the quantity demanded divided by the percentage change in the price. Income elasticity of demand: Income elasticity is about how much a change in consumer income causes a change in quantity demanded. Normal goods (most goods fall into this category) are goods that consumers buy more of when their incomes rise, and less of when their incomes fall. Inferior goods are goods like one-ply toilet paper, top ramen, or generic brand products. When consumers’ incomes rise, consumers buy less of