For inferior goods, this relationship is just the reverse. Move the slider in Figure 3 to experience rightward and leftward shifts in demand. The price of other goods also affects the demand for products. Like income, this relationship depends on the goods in question, and a change in the price of a related good also causes a shift in demand. Coke and Pepsi are excellent examples of substitutes.
Complements tend to be products that people consume as a group.
If tastes change over time, product demand will shift. If your boss informs you that you'll receive a substantial raise next month, you may begin spending more money this month, thereby acting on your expectation of a higher future income. This information is contained in the following table. It is important to note that the market supply for CDs is simply a horizontal summation of each individual supply in the market. Finally, notice that the supply curves in the figure at right have a positive slope.