Why do we need a units-free measure of the responsiveness of the quantity demanded of a good or service to a change in its price? Because elasticity is a units-free measure of the responsiveness of the quantity demanded of a good or service to a change in its price __ A. elasticity is dependent on the units in which the variable is measured B. we can compare the responsiveness of the same good when quantity is measured in different units, or we can compare across different goods C. elasticity is equal to the slope of the demand curve D. elasticity is equal to the negative of the slope of the demand curve

The correct answer is B. we can compare the responsiveness of the same good when quantity is measured in different units, or we can compare across different goods.<br /><br />Explanation:<br />Elasticity is a units-free measure of the responsiveness of the quantity demanded of a good or service to a change in its price. This means that elasticity is not dependent on the units in which the variables are measured. By using elasticity, we can compare the responsiveness of the same good when the quantity is measured in different units, or we can compare the responsiveness across different goods.<br /><br />Option A is incorrect because elasticity is not dependent on the units in which the variables are measured. Option C is incorrect because elasticity is not equal to the slope of the demand curve. Option D is incorrect because elasticity is not equal to the negative of the slope of the demand curve.