The impairment charge is a result of risky investments, including RBMS (mortgage) investments backed by subprime loans and Alt-A loans, which are made to borrowers with a slightly better credit profile than those in the subprime category, as well as from collateral debt obligations (CDOs).
減損課徴金は、債務担保証券（CDO）と同じく、サブプライム・カテゴリーよりわずかに良い信用プロフィールで貸し出されるサブプライム・ローンとアルト-Aローンで裏書きされるRBMS（抵当）投資を含む危険な投資の結果である。