If the elasticity of demand for college textbooks is -0.1, and the price of textbooks increases by 20%, how much will the quantity demanded change, and in what direction

The quantity demanded will decrease by 2%.

Explanation:

This can be determined using the elasticity formula as follows:

e = Percentage change in quantity demanded change / Percentage change in price (1)

Where;

e = elasticity of demand for college textbooks = -0.1

Percentage change in quantity demanded change = ?

Percentage change in price = 20%

Substituting the values into equation (1) and solve for Percentage change in quantity demanded change

-0.1 = Percentage change in quantity demanded change / 20%

Percentage change in quantity demanded change = -0.1 * 20% = -0.02, or -2%

Since the Percentage change in quantity demanded change is negative 2%, it implies that the quantity demanded will decrease by 2%.

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