A second element of the controversy surrounding the GSE portfolios arises from the fact that they are not only large but also potentially subject to significant volatility and financial risk (including credit risk, interest-rate risk, and prepayment risk) and operational risk.
Many observers, including the Federal Reserve Board, have expressed concern about the potential danger that these portfolios may pose to the broader financial system; that is, the GSE portfolios may be a source of systemic risk (Greenspan, 2005a).