The fund manager employs an indexing investment approach designed to track the performance of the target index, which includes fixed income securities issued by the U.S. Treasury (not including inflation-protected securities, floating rate securities, and certain other security types) that have maturities up to 12 months. Under normal circumstances, it invests at least 80% of its assets, plus the amount of any borrowings for investment purposes, in the bonds that make up the target index.