Index funds can come close to duplicating the performance of the index they are targeting.
Like any index fund, it will not be able to precisely match the performance of an index. The Index 500 Fund seeks to achieve capital appreciation, rather than income. Index funds typically buy and sell stocks less frequently than actively managed funds, which minimizes the distribution of capital gains to investors. While returns from stocks fluctuate over the short-term, over the long term they have consistently outperformed other types of investments. Share prices will also vary and shares may be worth more or less at redemption than at original purchase.