Glossary
Substitute goods goods that you might purchase instead of a particular good. For example, different types of bread are substitutes for each other.

Supply Function the mathematical function that relates price and quantity supplied for goods or services.  The supply function tells how many units of a good that producers are willing to produce and sell at a given price. 

Supply Curve - the graphical representation of the supply function.  Because producers would like to sell more at higher prices, the supply function slopes upward.

Total economic value the sum of all types of use and non-use values for a good or service.

Use value value derived from actual use of a good or service.  Uses may include indirect uses.  For example, enjoying a television show about whales provides an indirect use value for the whales.

Variable costs production costs that change when the level of production changes, so that when more is produced the costs increase; as opposed to fixed costs.

Willingness to Pay the amountmeasured in goods, services, or dollarsthat a person is willing to give up to get a particular good or service.