Comment by silverlake

It’s the same as buying a house. I want to buy a house for $1.2m. I put down $200k and borrow $1m. The bank determines the value of the house. My equity absorbs a 20% drop in prices, so the bank is fairly protected. Businesses are different because they really can go to $0. Banks will need more collateral and/or make many different types of loans to dilute the risk.