Bloomberg - "Housing Threatened by Defaults in Sub-Prime Mortgage Market" (2-1-07)

"Sub-prime mortgages, home loans with rates at least 2 or 3 percentage points above the safest, so-called prime loans, are given to people with poor or limited credit histories, or high debt burdens relative to their incomes. Such loans made up about a fifth of all new mortgages last year, according to the Mortgage Bankers Association in Washington."