Under normal market conditions, the fund invests at least 80 percent of its net assets, plus borrowings for investment purposes, in fixed income securities. Corporate debt securities, including notes, bonds, debentures and commercial paper, are fixed income securities usually issued by businesses to finance their operations. These securities may be secured or unsecured, may be issued by U.S. or foreign entities and may carry variable or floating rates of interest. The fund may invest in Rule 144A securities. The fund may also invest in other short-duration fixed-income securities, such as floating rate loans and structured debt and in cash or cash equivalents such as money market securities. Securities in which the fund will invest will be U.S. dollar-denominated although they may be issued by a foreign corporation or a U.S. affiliate of a foreign corporation, or a foreign government or its agencies and instrumentalities, including those in emerging markets.