The graph shown displays the cost and revenue curves associated with a monopolistically competitive firm. 
In the graph, area C represents:
Definitions:
Coupon Rate
The coupon rate is the annual interest rate paid by a bond relative to its face value, expressed as a percentage.
Principal Amount
The initial size of a loan or bond or the amount of money invested, excluding any interest or dividends.
Coupon Rate
The interest rate stated on a bond or fixed-income security, representing the annual payout as a percentage of the bond's face value.
Interest Payments
The payments made by borrowers to lenders as a fee for using the borrowed money, typically expressed as an annual rate.
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