Find the derivative. 
Definitions:
Perfectly Competitive Firm
A company that operates in a market where there are many buyers and sellers, no barriers to entry, and the product is homogeneous, leading to no control over price by individual firms.
Market Price
The contemporary selling or buying price for an asset or service.
Profit-Maximizing
The process of adjusting production and sale strategies to achieve the highest possible profit under given conditions.
Incur A Loss
The situation in which the costs of operating a business exceed the revenues, leading to negative profits.
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