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Demand
The willingness to buy a good or service and the ability to pay for it.

Law of Demand
When prices go down, quantity demanded increases. When prices go up, quantity demand decreases.

Demand Schedule
Listing of how much of an item an individual is willing to purchase at each price.

Market Demand Schedule
Listing of how much of an item all consumers are willing to purchase at each price.

Demand Curve
Graphically shows data from Demand Schedule.

Market Demand Curve
Graphically shows data from Market Demand Schedule.

Law of Diminishing Marginal Utility
The marginal benefit of using each additional unit of a product during a given period will decline.

Income Effect
The change in the amount that consumers will buy because the purchasing power of their income changes.

Substitute Effect
A change in the amount that consumers will buy because they buy substitute goods instead.

Change in Quantity Demand
An increase or decrease in the amount demanded because of a change in price.

Change in Demand
Occurs when something prompts consumers to buy different amounts at every price.

Normal Goods
Goods that consumers demand more of when their incomes rise

Inferior Goods
Goods that consumers demand less of when their incomes rise.

Substitutes
Goods and services that can be used in place of each other

Complements
Goods that are used together, so a rise in demand for one increases the demand for the other.

Elasticity of Demand
A measure of how responsive consumers are to price changes.

Elastic
Demand is elastic if quantity demanded changes significantly as the price changes.

Inelastic
Demand is inelastic if quantity demanded changes little as price changes.

Unit Elastic
Demand is unit elastic when the percentage change in price and quantity demanded are the same.

Total Revenue
A company’s income from selling its products.

Total Revenue Test
A method of measuring elasticity by comparing total revenues.
