A price elasticity of zero corresponds to a demand curve that is: Select one: O A. horizontal. O B. either vertical or horizontal. O C. vertical. O D. downward sloping with a slope always equal to 1. e When marginal revenue is negative for a linear (inverse) demand function, increases in output will cause total revenues to: Select one: O A. decrease. O B. remain unchanged. O C. increase. O D. There is not sufficient information to answer the question. Next P