Figure: Demand Curve 
Refer to the figure. What is the maximum amount that buyers are willing and able to pay at a price of $45 per book?
Definitions:
Train Fares
The price charged to passengers for traveling on a train, which can vary based on distance, class, and timing.
Tariffs
Taxes imposed on imported goods, often used by governments to regulate trade by increasing the cost of foreign products to protect domestic industries.
Dealer Rebate
A financial incentive provided by manufacturers to dealers, typically after the sale of a product, to encourage stocking and selling their products.
Trade-in Allowance
The amount credited to the buyer by a seller when the buyer returns a product, typically used as part payment for a new purchase.
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