Use the following to answer questions:
Figure: Sofas and Windows 
-(Figure: Sofas and Windows) In the PPF diagram, what is the opportunity cost of producing an additional window?
Definitions:
Interest Rate
The amount charged, expressed as a percentage of principal, by a lender to a borrower for the use of assets.
Usury Laws
Legal statutes regulating the maximum interest rates that can be charged on loans, aimed at preventing predatory lending practices.
Interest Rates
The proportion of a loan charged as interest to the borrower, typically expressed as an annual percentage of the loan outstanding.
Price Mechanism
The system by which the forces of supply and demand determine the prices of goods and services.
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