Khan Academy: Adding Demand Curves

Where does a buyer's demand curve come from? A rational buyer wants to get as much 'bang per buck' from their consumption as possible. In economics, that's called marginal utility per dollar spent. In this video, we derive the...

Learn how to add demand curves in this video lecture. [6:17]

This article explains how the concepts of supply and demand can be applied to the economy as a whole. Includes examples of an aggregate demand curve and an aggregate supply curve, and review questions at the end.

Video lecture explores how changes in the price of related goods can shift demand. [5:48]

This video examines what happens to quantity demanded when the price changes. [8:43]

Explores what happens to demand if the price of something is expected to go up or down in the future.

Looks at an example of the law of demand. [8:16]

Explains how the demand for some goods could actually go down if incomes go up. [5:56]

The market demand for a good describes the quantity demanded at every given price for the entire market. Remember that the entire market is made up of individual buyers with their own demand curves. This means that the market demand is...

Practice what you've learned about the wealth effect, interest rate effect, exchange rate effect, and the factors that shift aggregate demand (AD) in this exercise.