Public funds refer to funds that fund companies can publicly promote to the public and raise funds publicly. Public funds have a relatively low starting point and relatively low risks, making them suitable for many retail investors.

Public funds have no disadvantages for investors, but for fund managers, investment is subject to Double Ten restrictions, so they must be considered when buying and selling stocks.

The Double Ten principle for public funds is: a fund cannot hold more than 10% of the fund's assets in the same stock; all funds managed by the same fund manager in a fund company must not hold more than 10% of the market value of the same stock.

The Double Ten regulations have put a tight spell on public funds, forcing them to continuously move down the top of the pyramid when investing in companies. This reduces the rate of return and increases the risk of investment.