The fund invests primarily in U.S. dollar denominated securities, although the fund may also invest in non-dollar denominated securities. Although it has the flexibility to invest above 65% of its total assets in investments that are rated below investment grade (also known as junk bonds or high yield securities) or the unrated equivalent to take advantage of market opportunities, under normal market conditions the fund invests at least 35% of its total assets in investments that, at the time of purchase, are rated investment grade or the unrated equivalent.