If mortgage bonds are secured corporate bonds then how did the subprime bubble happen?

kmm asked: I am trying to understand secure bonds and I know mortgage bonds are secured bonds,if that is the case,even if they default ,the investor should get the prinicipal back.Can someone give an explanation of this works.

Where to find free start-up finance spreadsheet to show potential investor eg 3yr revenue projection, etc?

jane asked: I co-founded a start-up. Business plan is in the work. I still need to work on the financial section. I know I should have a CFO work on it. But I don’t have $$ to pay/hire a CFO. So I get to wear the finance hat too among [...]