Economically significant prices are prices that have a significant effect on the amounts that producers are willing to supply and on the amounts purchasers wish to buy.

These prices normally result when: (a) the producer has an incentive to adjust supply either with the goal of making a profit in the long run or, at a minimum, covering capital and other costs and (b) consumers have the freedom to purchase or not purchase and make the choice on the basis of the prices charged.

System of National Accounts 2008