The production of toilet paper in a perfectly competitive market is characterized by the inverse supply curve (marginal cost curve) P = 4Q, where Q is measured in millions of 4-roll packs per month. The inverse demand for toilet paper is P = 10 - 6Q. 
Definitions:
Economic Profit
The deviation between complete financial gains and all-encompassing charges, covering both transparent and obscured costs.
Normal Rate
Often refers to a benchmark interest rate considered typical or average within an economic environment or financial product.
Economic Profit
The difference between total revenues and total economic costs (including both explicit and implicit costs), reflecting the additional income generated over and above the opportunity costs.
Normal Rate
A standard or typical rate used as a benchmark or point of reference, often in contexts like interest rates or economic growth rates.
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