A firm is producing at minimum average total cost with its current plant. Draw the​ firm's long-run average cost curve. Label it. Draw a point on the LRAC curve at which the firm cannot lower its average total cost. Draw the​ firm's short-run average total cost curve that is consistent with the point you have drawn. Label it. When the firm cannot lower its average total cost by changing its​ plant, then it is operating on its​ long-run average cost curve at a point with​ _______.