The Bank of Korea, for example, has resolved to buy unlimited amounts of bonds from financial institutions that promise to repurchase them after three months.
Valuing assets and extending credit against them is the preoccupation of the mortgage banker and the repo trader, who arranges trillions of dollars a day in repurchase agreements for very short-term government bonds.
Unfortunately we didn't have that much money so there were times where my punch card would run out and I wasn't able to eat for a while until we got enough money to repurchase another one.