Identify the structure indicated by the arrow in the image below. 
Definitions:
Marginal Cost
The additional cost incurred by producing one more unit of a good or service.
Marginal Benefit
The additional benefit derived from producing one more unit of a good or service.
Accounting Profit
The total revenue of a business minus its explicit costs; essentially the net income reported on the financial statements.
Economic Profit
The difference between the total revenue received by a business and the total costs, including both explicit and implicit costs.
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