ppose a firm is producing in the long run. When it produces 4,000 units of output, its total cost is $8,000. When it produces 4,200 units of output, its total cost is $8,200, and when it produces 4,400 units of output, its total cost is $8,800. This firm is experiencing Glick to salect returns to scale ncreasing then decreasing decreasing constant decreasing then increasing