The film visually explains how and why AAA grade mortgages, subprime mortgages, and intermediate grades of mortgages were mixed up and misrepresented as a wholly AAA financial instrument. They use blocks of wood stacked in a column with AAA blocks at the top and subprime blocks at the bottom. It makes it understandable for the uninformed man-in-the-street to understand. It is worth the time to watch it. It does not explain the bailout of the banks.