Purchase cost control is to purchase quantity and unit price of the stock control, focus on the purchase of the unit price control.

进货成本控制在于对进货数量和进货单价的控制，着重于进货单价的控制。

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For construction materials, it is common to receive discounts for bulk purchases, so the unit purchase cost declines as quantity increases.

建筑材料，是很常见的获得批量采购的折扣，所以购买的单位成本下降，从量的增加。

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For construction materials, it is common to receive discounts for bulk purchases, so the unit purchase cost declines as quantity increases.

建筑材料，是很常见的获得批量采购的折扣，所以购买的单位成本下降，从量的增加。

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