The following diagram shows a budget constraint for a particular consumer. 
If the price of X is $12, then what is the price of Y?
Definitions:
Yield to Maturity
The total return anticipated on a bond if it is held until the date it matures.
Annual Coupon
The annual interest payment received by bondholders, expressed as a percentage of the bond's face value.
Par Value
The face value of a bond or stock, as designated by the issuing company, which may not reflect the market value.
Premium
An amount paid for an insurance policy, or the cost above the nominal or face value of a financial instrument.
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