Investors can subscribe for crude oil lof fund shares in the OTC market, or buy and sell crude oil LOF funds in the OTC market. Investors can use LOF funds for arbitrage. If the price of spot crude oil LOF fund is higher than that of off-site crude oil LOF fund, they can buy it off-site and then transfer it to the market for sale. If the LOF fund price of spot crude oil is lower than that of OTC crude oil, it will be bought in the secondary market and redeemed off-site.