Under normal circumstances, the Fund invests at least 80% of its assets in bonds. For these purposes, bonds include fixed-income securities of all types. The Fund primarily invests in a broad range of investment-grade bonds and fixed-income securities, including, but not limited to, U.S. Government securities, corporate bonds, taxable municipal securities and mortgage-backed or other asset-backed securities. The Fund may also invest in other fixed-income securities, including those of non-investment- grade quality (usually called high-yield or junk bonds). Securities of non-investment-grade quality are speculative in nature. The Fund may invest in fixed-income securities of any duration. For purposes of the 80% investment policy, the term assets means net assets, plus the amount of any borrowings for investment purposes.