All else equal, what happens to consumer surplus if the price of a good decreases?
a. Consumer surplus increases.
b. Consumer surplus decreases.
c. Consumer surplus is unchanged.
d. Consumer surplus may increase, decrease, or remain unchanged.
The correct answer and explanation is :
The correct answer is:
a. Consumer surplus increases.
Explanation:
Consumer surplus refers to the difference between what consumers are willing to pay for a good or service and what they actually pay. It represents the benefit or value that consumers receive when they pay less than what they were willing to pay for a good. This is often depicted graphically as the area between the demand curve and the price level, up to the quantity purchased.
When the price of a good decreases, all else equal, the consumer surplus increases for the following reasons:
- Lower Prices Lead to Greater Quantity Demanded: According to the law of demand, as the price of a good decreases, the quantity demanded typically increases. This expansion in the quantity purchased means that more consumers can buy the product at the new lower price, and those who were already purchasing the good now benefit from paying less. The total amount of consumer surplus rises because more individuals are now willing and able to purchase the good at a lower price, contributing to a greater overall surplus.
- The Existing Consumers Benefit: Consumers who were already willing to purchase the good at a higher price now pay less, gaining additional surplus. For example, if a consumer was willing to pay $50 for a good but the price falls to $40, that consumer gains $10 in additional surplus.
- New Consumers Enter the Market: As the price falls, consumers who previously found the good too expensive are now willing to buy it. These additional consumers add to the total consumer surplus, as they are now able to purchase the good at a price lower than their willingness to pay.
In a graphical context, the reduction in price leads to a larger triangle (or area) between the price line and the demand curve, which represents consumer surplus. The increase in the size of this area is the result of the price decrease, indicating a higher level of consumer surplus.
Thus, when the price of a good decreases, consumer surplus unambiguously increases.