Eric's income increased from $40,000 to $50,000 per year. Eric's consumption of tickets to pro football games increased from two to four per year. By the midpoint formula, his income elasticity of demand for pro football game tickets is equal to , and football game tickets are goods. –3; inferior –0.33; inferior +0.67; normal +3; normal

By the midpoint formula, his income elasticity of demand for pro football game tickets is equal to +3, and football game tickets are normal goods.

Explanation:

The formula for calculating income elasticity of demand using the midpoint method is:

income elasticity of demand = {change in quantity demanded / [(old quantity + new quantity) / 2]} / {change in income / [(old income + new income) / 2]}

= {2 / [(2 + 4) / 2]} / {10,000 / [(40,000 + 50,000) / 2]} = (2 / 3) / (10,000 / 45,000) = 0.67 / 0.222 = 3

when the income elasticity of demand is higher than 1, the goods are normal goods.

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