| Principle | Definition |
| market value of all final goods and services produced within a country at a given period of time | |
| input costs that require an outlay of money by the firm | |
| proposition that if private parties can bargain without cost over the allocation of resources, they can solve the problem of externalities on their own | |
| the uncompensated impact of one person's actions on the well-being of a bystander | |
| property whereby long-run average total cost rises as the quantity of output increases | |
| increase in total cost that arises from an additional unit of input | |
| two goods for which an increase in the price of one leads to a decrease in the demand for the other | |
| a tax for which high-income taxpayers pay a larger fraction of their income than do low-income taxpayers | |
| business practice of selling the same good at different prices to different customers | |
| an agreement among firms in a market about the quantities to produce or prices to charge | |
| total taxes paid divided by total income | |
| change in total revenue from an additional unit sold | |
| measure of the responsiveness of quantity demanded or quantity supplied to one of its determinants | |
| a group of firms acting in unison | |
| total revenue minus total cost, including both explicit and implicit costs | |
| a market structure in which many firms sell products that are similar but not identical | |
| goods that are both excludable and rival in consumption | |
| a shortfall of tax revenue from government spending | |
| goods that are neither excludable nor rival in consumption | |
| quantity of goods and services produced from each unit of labor input | |
| goods that are rival in consumption but not excludable | |
| measure of how much the quantity demanded of a good responds to a change in consumers' income, computed as the percentage change in quantity demanded by the percentage change in in | |
| amount a firm receives for the sale of its output | |
| the relationship between the quantity of inputs used to make a good and the quantity of output of that good | |
| market with many buyers and sellers trading identical products so that each buyer and seller is a price taker | |
| a parable that illustrates why common resources are used more than is desirable from the standpoint of a society as a whole | |
| a legal maximum on the price at which a good can be sold | |