The principle of military ETF (transactional open index fund) is somewhat similar to cake. Index companies (recipes) build index models of different constituent stocks (military stocks) in proportion, and fund companies (chefs) package them and buy them to make cakes (ETFs). These cakes can be divided into small pieces, listed and traded in the exchange market, and freely circulated in the hands of investors (consumers) as needed.

Those with high spending power can buy in large quantities, and those with low spending power can start with one hand (100 shares). Every time you buy a hand (100) of the military ETF, its portfolio contains the military stocks of the CSI military index, which is the same as the ingredients contained in every small cake.