economies of scale diseconomies of scale economic profit accounting profit economies of scale diseconomies of scale economic profit accounting profit SATCLong-Run Average Cost 9 5 SATC SATC2 SATC 0 300 600 900 200 1500 Quantity Solution d) Accounting profit In the long-run there is zero economic profit. Firms earn only normal profit. Also, in the long-run firms can adjust their production capacities as per the demand and hence economies / diseconomies of scale are not experienced..