Rates moved lower Monday in spite of S&P’s credit ratings downgrades of Fannie Mae, Freddie Mac, and Federal Home Loan Bank debt. These follow Friday’s downgrade of US debt. A flight to quality from riskier assets, such as stocks and commodities, boosted Treasury bonds and mortgage-backed securities. Oil prices fell sharply, while gold prices surged. Investors are also focusing on the slowing pace of global economic growth. Markets are likely to remain extremely volatile in the coming days. No key economic data will be released today.