In principle, Class C funds do not charge subscription fees, and then they are replaced by sales service fees. Unlike the one-time subscription fee, the sales service fee is calculated on an annual basis (for example, 0.2% per year), and then evenly distributed to each day, and then deducted from your assets. From the accounting point of view, capital is a narrow concept, which refers to funds with specific purposes and uses. The fund we are talking about mainly refers to the securities investment fund.

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According to different standards, securities investment funds can be divided into different types: according to whether the fund share can be increased or redeemed, it can be divided into open-end funds and closed-end funds. Open-end funds are not traded on the market (as the case may be), but are purchased and redeemed by banks, brokers and fund companies, and the fund scale is not fixed; Closed-end funds have a fixed duration and are generally listed and traded on the stock exchange. Investors buy and sell fund shares through the secondary market. According to different organizational forms, it can be divided into corporate funds and contractual funds. A fund is established by issuing fund shares to establish an investment fund company, which is usually called a corporate fund; The establishment of fund managers, fund custodians and investors through fund contracts is usually called contractual funds. China's securities investment funds are all contractual funds.

Hedge fund, meaning "risk hedge fund", originated in the United States in the early 1950s. At that time, its operation purpose was to use financial derivatives such as futures and options to buy and sell related stocks, and the risk hedging operation skills could avoid and resolve investment risks to a certain extent. 1949 The first Jones hedge fund with limited cooperation in the world was born. Although hedge funds appeared in the 1950s, they did not attract much attention in the next 30 years. Until 1980s, with the development of financial liberalization, hedge funds had broader investment opportunities and entered the stage of rapid development. ETF is an open-end securities investment fund product listed and traded on the exchange, and the trading procedure is exactly the same as that of stocks. The assets managed by ETF are stock portfolios. The types of stocks in this portfolio are the same as those in a specific index, such as the SSE 50 Index, and the number of each stock is consistent with the proportion of the constituent stocks of this index. The transaction price of ETF depends on the value of its stock portfolio, that is, the "net asset value of unit fund". ETF's portfolio usually completely replicates the underlying index, and its net performance is highly consistent with the specific index pegged. For example, the net performance of SSE 50ETF is highly consistent with the rise and fall of SSE 50 index.