What can cause the demand curve to shift to the right?

• A. A decrease in consumer income
• B. An increase in the price of complements
• C. A rise in consumer income
• D. A decrease in consumption preferences

Answer: (C)

The demand curve shifting to the right indicates an increase in demand for a good or service at every price level. A rise in consumer income typically leads to an increase in demand, particularly for normal goods, which are those that consumers buy more of as their income increases. When consumers have more disposable income, they are more likely to purchase more products, leading to this rightward shift in the demand curve.

This relationship is rooted in basic economic principles, where greater income allows consumers to afford more goods and services, thus increasing their demand. Conversely, a decrease in income or changes in preferences can lower demand, which is why those factors would lead to shifts in the opposite direction.