Final answer:
Farmer Mac is the secondary market that would potentially buy first-mortgage agricultural real estate loans, providing liquidity and stability to the agricultural credit markets.
Step-by-step explanation:
If a lender makes first-mortgage agricultural real estate loans, the secondary market that would be a potential buyer of these loans is Farmer Mac (the Federal Agricultural Mortgage Corporation). Unlike Fannie Mae and Freddie Mac, which mainly focus on residential mortgages, or Ginnie Mae, which guarantees securities backed by federally insured or guaranteed loans, Farmer Mac is specifically designed to provide a secondary market for agricultural real estate and rural housing mortgage loans. This ensures liquidity, stability, and affordability in the agricultural credit markets.