Which of the following statements about price elasticity of demand is true?
a. the inelastic portion of the demand curve corresponds to the segment above the midpoint.
b. the elastic portion of a straight-line, downward-sloping demand curve corresponds to the segment above the midpoint.
c. at the midpoint of the demand curve, the elasticity coefficient is zero.
d. the elasticity coefficient is constant along the demand curve.

B. The elastic portion of a straight-line, downward-sloping demand curve corresponds to the segment above the midpoint.

Explanation:

Elasticity measures the sensitivity of one variable to another. Specifically it is a figure that indicates the percentage variation that a variable will experience in response to a variation of another one percent.

The elasticity of demand measures the reaction of demand when one of the factors that affects it varies.

Elasticity - Price of demand.

easure the sensitivity of the quantity demanded to price variations. It indicates the percentage variation that the quantity demanded of a good will experience if its price rises by 1 percent.

Elastic Demand

The demand quantity is relatively sensitive to price variations, so the total expenditure on the product decreases when the price rises, the price elasticity takes value greater than -∞ but less than -1

force tends to be low and long diustance masses are high