Why not?-I'm just curious. If a country has a lot of US debts - a lot of gold as well ,but is not able to pay interest on the loan in cash-why US would't accept gold as collateral?
Edit: This is hypothetical question-I don't know any country with a lot of gold and with big US debts.
I can only think it's the way the loans are structured and how the Fed can balance its books and what it does with the USD when it is returned (profit is remitted to treasury and the principle is destroyed??) ie the loan is made in USD so it can only be paid back in USD. I'm going to check another book so if anything crops up I'll let you know.

