Multiple Select Question Select all that apply Which of the following are effects of an increase in the price of labor on the cost curves? Multiple select question. The average-variable-cost and average-total-cost curves shift upward, and the marginal-cost curve shifts downward. The average-variable-cost, average-total-cost, and marginal-cost curves shift downward. The average-variable-cost, average-total-cost, and marginal-cost curves shift upward. The average-fixed-cost curve remains the same