Final answer:
An increase in a consumer's income will cause the demand curve for generic medicine to shift to the left because it is an inferior good.
Step-by-step explanation:
An increase in a consumer's income will cause the demand curve for generic medicine to shift to the left. This is because generic medicine is an inferior good, which means that as income increases, the demand for generic medicine decreases. The income elasticity of demand for generic medicine is negative. When income rises, people are more likely to buy brand name equivalents instead of generic medicine.