"Collateralized Debt Obligations" (CDOs) are a financial derivative that is a kind of bond that pays out based on revenue generated by a pool of assets: for example, a giant hedge fund might buy thousands of homes whose owners went bankrupt and suffered through foreclosure, and then rent them out at the highest possible rent with the least possible maintenance, and this generates thousands of revenue streams. Small slices of the revenue streams from many properties are pooled together into individual CDOs and these are sold to investors: when you buy one of these, you get a little bit of the rent from each of the tenants in the hedge-fund's holdings (other assets can be pooled together too, like payments on car loans, student loans, etc etc). Read the rest