Which of the following is true about a Sweezy oligopoly?
Select one:
a. The marginal cost function has a downward "jump" or "discontinuity."
b. The marginal revenue function has a downward "jump" or "discontinuity."
c. The marginal cost function has an upward "jump" or "discontinuity."
d. The marginal revenue function has an upward "jump" or "discontinuity."