ETF can be purchased and redeemed in the primary market, and can be bought and sold in the secondary market. The share of ETF subscription is at least 6,543,800+0,000, that is, 800,000 yuan. Both purchase and redemption are included in the stock package. You can buy and sell like stocks in the secondary market, at least 100 copies. ETF can be bought in the primary market and sold in the secondary market on the same day, but it can't be redeemed on the same day and can't be sold in the secondary market on the same day.