The graph shown displays a market with an externality. 
Which of the following statements is true?The efficient quantity is 6 units.This shows a negative production externality.The size of the externality is $4 per unit.
Definitions:
Coupon Payment
The annual interest payment made to bondholders, typically expressed as a percentage of the face value.
Interest Rate Index
A benchmark interest rate that serves as a reference point for determining interest rates on various financial instruments or loans.
Coupon Rate
The yearly interest rate that a bond yields, represented as a percentage of its nominal value.
Face Value
The nominal or dollar value printed on a bond or stock certificate, representing the amount due at maturity or the value of a share.
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