Answer:
Consumer surplus
producer surplus
neither
Explanation:
Consumer surplus is the difference between the willingness to pay of a consumer and the price of the good.
Consumer surplus = willingness to pay – price of the good
The willingness to pay for the watch was $83 but the watch was bought for $75. There is a consumer surplus from the purchase
Producer surplus is the difference between the price of a good and the least price the seller is willing to sell the product
Producer surplus = price – least price the seller is willing to accept
The least price the seller was willing to accept for the purchase was $47 but he was paid $55 for the textbook. This is a producer surplus