Why is it unfair to the employer that the engineering quantity has increased too much and is priced according to the original comprehensive unit price?

The prerequisite is that the project is profitable. After the unit cost is determined, the profit rate can also be determined. The more you do, the more money you earn. But in the market, the purchase price of raw materials is inversely proportional to the quantity. If you buy more, you can reduce the price according to certain rules. In the price of buying a catty of apples, the price of buying a catty of apples for customers is different from that of buying a catty of apples for customers at one time. Therefore, all government projects have a controlled budget, which cannot exceed the estimated budget, and the final accounts cannot exceed 10% of the budget.

The recent bidding for the quantity of medical insurance drugs is the most obvious example of "exchanging quantity for price".