A.银行资本需要量与资本成本正相关
B.银行资本需要量与资本成本负相关
C.银行资本成本曲线呈“U”字形,其最低点对应的资本量为最佳资本需要量
D.银行规模越大,资本需要量相对地也越多
If the firm' s average cost curves are U-shaped, why does its average variable cost curve achieve its minimum at a lower level of output than the average total cost curve?