Gold itself is just a commodity that everyone can buy and trade. Because of the high value of gold, many people buy gold to preserve its value. The state also wants to preserve the value of the funds in the national treasury, so it also buys gold, but it has no right to ask others not to buy it. Of course, in a special period, the state may ask for a ban on gold trading. For example, in wartime, the state may require citizens to prohibit the trading of gold to prevent it from flowing into other countries, or forcibly requisition all citizens' property, including gold, and concentrate all their efforts to win the war.