Final answer:
Consumer surplus in the market for oak cabinets decreases when the price of oak increases, as consumers pay a higher price for the same or a lower quantity, leading to a reduction in the value they receive for their purchase. So the correct answer is option C.
Step-by-step explanation:
If the price of oak increases, consumer surplus in the market for oak cabinets decreases. This scenario can be analyzed from an economics standpoint where consumer surplus is defined as the difference between what consumers are willing to pay for a good and what they actually pay.
If the price increases, consumers now pay more for the same quantity, or they pay the higher price for a lower quantity, which means they receive less surplus from their purchase. Referring to the steps provided, when barriers to trade are imposed, resulting in an increase in price, domestic quantity supplied increases (due to producers seeing a chance to sell at a higher price), and thus producer surplus increases, represented by the area of a triangle on the supply and demand graph.
However, the consumer surplus shrinks as consumers are now faced with a higher price, which translates to them getting a lower quantity (Q instead of Q d). The consumer surplus is now to the area of the triangle P No Trade, E, and B. In summary, with an increased price and other factors constant, consumers experience a drop in consumer surplus because they are either paying more for the same amount or receiving a reduced quantity for their money.