In the following figure,the socially efficient level of output is equal to ________. 
Definitions:
Mortgage Pass-through Agency
A financial entity that aggregates mortgage loans and creates pass-through securities representing interests in those loans.
Ginnie Mae
Ginnie Mae, or the Government National Mortgage Association, guarantees timely payment of principal and interest on mortgage-backed securities.
Sallie Mae
A corporation that originates, services, and collects student loans in the United States.
Default Risk Premiums
The additional yield a bond issuer must pay to compensate investors for the risk that the issuer might not make payments as promised.
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