Read this to learn about how factors that affect demand, such as income and change in tastes, are graphed as shifts of the demand curve. Make sure to answer the "Try It" questions.
Other Factors That Shift Demand Curves
Income is not the only factor that causes a shift in demand. Other things that change demand include tastes and preferences, the composition or size of the population, the prices of related goods, and even expectations. A change in any one of the underlying factors that determine what quantity people are willing to buy at a given price will cause a shift in demand. Graphically, the new demand curve lies either to the right (an increase) or to the left (a decrease) of the original demand curve. Let's look at these factors.