Calculate the iterated integral. 
Definitions:
Purely Competitive
A market structure characterized by a large number of small firms, homogeneous products, and free entry and exit, leading to price taking behavior.
Marginal Costs
The upsurge in full cost that comes from the generation of one additional unit of a good or service.
Short Run
A period in economic analysis where at least one input is fixed, focusing on immediate effects and adjustments in production or operations.
Marginal Revenue
The increased revenue a company achieves from the sale of an additional good or service unit.
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