The following diagram represents the market for paperback books.Which area represents producer surplus? 
Definitions:
African-American
Pertaining to Americans of African ancestry; also, can refer to cultural, historical, and social attributes of this group.
Traffic Light
A device typically positioned at road intersections and pedestrian crossings to manage traffic flow by using a visual signaling system consisting of red, yellow, and green lights.
Strategies
Plans of action designed to achieve a long-term or overall aim.
Quarterly Sales
The total revenue or volume of sales achieved by a business within a three-month period.
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