The Fund generally uses a “replication” strategy to achieve its investment objective, meaning the Fund generally invests in all of the component securities of the Index in the same approximate proportions as the Index, but may, when the Fund’s portfolio manager believes it is in the best interests of the Fund, use a “representative sampling” strategy, meaning it may invest in a sample of the securities in the Index whose risk, return, and other characteristics closely resemble the risk, return, and other characteristics of the Index as a whole (e.g., when replicating the Index involves practical difficulties or substantial costs, an Index constituent becomes temporarily illiquid, unavailable, or less liquid, or as a result of legal restrictions or limitations that apply to the Fund but not to the Index). Under normal circumstances, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in the securities comprising the Index and in investments that have economic characteristics similar to the securities comprising the Index.