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广告占销售额的比例ACO。要降低ACO，分母不变的情况下需要降低分子。在分子不变的情况下，提高销售额或降低花费可以降低ACO。
ACO is calculated by dividing advertising expenses by sales. To decrease the minimum value of AC, the numerator must be reduced without changing the denominator. This can be achieved by increasing sales or reducing expenses and investments simultaneously in order to increase sales.
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