He misused the terminology but basically got it right. The originator of the loan (your local bank is probably just a broker, who is acting as an intermediary for a wholesale vendor) then sells it to a REMIC[1]. It's tranched by the REMIC and sold off to institutional investors. These were properly labeled as mortgage backed securities[2] for residential real estate. This is all by the book, mind you. At least that's how it was conventionally done. If our housing market crashed with this system in place, we would have seen a hit but it wouldn't have affected things nearly as badly. It became 'systemic' when bankers decided to trade 'synthetic CDOs' in volume[3].[1] https://en.wikipedia.org/wiki/Real_estate_mortgage_investmen... - [For context, Freddie Mac/Fannie Mac were REMICs] So what OP meant when he said "prime / subprime" was a misuse of terminology, but if he replaces 'prime' with 'AAA' and sub-prime with 'BBB and Residual' -- he's more or less on the mark there.
[2] US-FNMAMBS, IIRC
[3] https://en.wikipedia.org/wiki/Collateralized_debt_obligation... Start reading here
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