Below the MES level, there may be diseconomies of scale.（ ） A: 对 B: 错

A dynamic welfare gain resulting from the formation of the European Union would be: A: Trade diversion B: Trade craetion C: Diseconomies of scale D: Economies of scale

In the long run Firm A incurs total costs of $1,200 when output is 30 units and $1,600 when output is 40 units. Firm A exhibits_________. A: constant returns to scale because average total cost is constant as output rises B: diseconomies of scale because total cost is rising as output rises C: economies of scale because average total cost is falling as output rises D: diseconomies of scale because average total cost is rising as output rises

"Diseconomies of scale" occur in ( ) A: the long run, but not the short run. B: the short run, but not the long run. C: both the short run and the long run. D: neither the short run nor the long run.