In theory, precious metals are easy to make, the spot market price of agricultural products is opaque, the trading mechanism has many restrictions, and even many overlord clauses. Silver is relatively slightly better. However, most small platforms of silver also have behind-the-scenes controllability and trading restrictions. The domestic futures market is more rigorous and has a long development cycle, and the spot is introduced from abroad. On the contrary, foreign spot market is better than futures market. Then in the spot market, the most perfect product should be spot gold, and the rest of the products are its derivatives.