The fund invests primarily (80% or more of its net assets, including the amount of any borrowings for investment purposes) in investment-grade debt securities of domestic issuers, including the U.S. government and its agencies and instrumentalities, corporations and municipalities and money market instruments. It may invest up to 20% of its net assets in equity securities (which includes preferred stocks, common stocks paying dividends and securities convertible into common stock) of domestic or foreign issuers of any market capitalization.