From 1999 to 2009, the "advent and growth of debt buying", that is "the purchasing, collecting, and reselling of debts in default" was considered to be the "most significant change" in the "debt collection business". According to Sacramento, California-based Debt Buyers Association (DBA), a debt buyers trade association, by 2008 there were "hundreds, and possibly thousands" of debt buyers. The debt buying industry was highly concentrated according to "The Nilson Report" with only ten debt buyers "responsible for 81 percent of all of the credit card debt purchased in fiscal year 2007."