Due to the influence of market conditions, the unit price of direct cost often changes and consumes a lot of manpower, material and financial resources to purchase new quota, which becomes a burden for relevant units and individuals. This is the problem of volume price combination. In the era of planned economy, the strict unit price of direct cost of planned price is relatively stable and the revision cycle of budget quota can be relatively long. This contradiction is not very prominent. With the gradual opening of the price of means of production, the contradiction between "living price and dead budget" has become increasingly prominent, and the method of adjusting the difference of main materials has been adopted for adjustment, but the price formed by the traditional quotation mode of "guiding" which is still inseparable from the budget price and legal rate is a kind of directive price.<br>
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