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Find the relative extrema, if any, of the function.Use the second derivative test, if applicable.
Surplus
The amount by which the quantity of a product or service available exceeds the quantity demanded at the current price.
Shortage
A situation in which quantity demanded is greater than quantity supplied.
Purchasing-Power Parity
An economic theory that compares different countries' currencies through a "basket of goods" approach, suggesting that exchange rates should adjust so that identical goods cost the same in different countries.
Foreign-Currency Exchange
The process of converting one country's currency into another, facilitating international trade and investment through varying exchange rates.
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