The Following Questions Refer to the graph below. 
-What is the efficient quantity of the polluting firm's product?
Definitions:
Euros/Dollar
The exchange rate between the euro and the U.S. dollar, indicating how much one euro is worth in U.S. dollars or vice versa.
Exchange Rate
What one currency equals in terms of another currency's value.
Purchasing-Power Parity
An economic theory that compares different countries' currencies through a "basket of goods" approach, suggesting that exchange rates should adjust to equalize the cost of this basket between countries.
Real Exchange Rate
The speed at which an individual is able to convert the money of one nation into that of another, taking inflation into account.
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