What Factors Affect Demand? 

The following factors often affect the demand for a product:

• Taste Shift
• Change in Population
• Change in Income
• Change in Price of Substitute Goods
• Change in Price of Complementary Goods
• Future Expectations of Financial Position

A change in any of these factors can cause a shift in demand. The change generally results in the desire or need for a greater or lesser quantity of a good or service at a given price.