| the desire, willingness, and ability to buy a good or service | | |
| a table that lists the various quantities of a product or service that someone is willing to buy over a range of possible prices | | |
| a graph that shows the amount of a product that would be bought at all possible prices in the market | | |
| according to this law, quantity demanded and price move in opposite directions | | |
| the total demand of all consumers for their product or service | | |
| the pleasure, usefulness, or satisfaction we get from using the product | | |
| the principle that our additional satisfaction, or our marginal utility, tend to go down as more and more units are consumed | | |
| consumers can use one product/service in place of another | | |
| when products can be used together | | |
| the extent to which a change in price causes a change in the quantity demanded | | |