Those are standard, unsecured bonds. They're not loans against anything in the endowment.

Right, and the endowment already uses leverage, so many of the endowment's assets will already serve as security for loans.

Sure, but that's margin trading. These bonds have nothing to do with the endowment.

Yeah, sorry I didn't make it clear enough that I was agreeing with you. The endowment's assets are likely mostly/all pledged as security for margin trading, in which case there may be few/no assets left which could serve as collateral for borrowing that will fund payouts.