Use the following to answer questions:
Figure: Market for Vaccines 
-(Figure: Market for Vaccines) Refer to the figure. The figure represents the market for vaccines with external benefits. The market's outcome generates a(n) :
Definitions:
Debt Ratings
Assessments provided by rating agencies that evaluate the creditworthiness of debt issuers and their financial instruments.
Default Risk
Default risk is the chance that a borrower will be unable to make the required payments on their debt obligations.
Interest Rate Risk
The risk of loss to an investor from changes in the price of a bond that arise from changes in the market interest rate. Also called price risk and maturity risk.
Maturity Risk
Maturity risk pertains to the uncertainty and potential loss associated with holding a bond or other fixed-income investment until its maturity date.
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