We can imagine from ourselves that you have money, but you can't keep it in the bank. What would you do? It's simple. Look at the older generation. They all put their wallets in a hidden place in the room. Isn't there a news report that the old man put a lot of money and was bitten or corroded by a mouse somewhere? This is the most basic way to save money. Men can also learn to save money.
But corrupt officials have a lot of money. If they are not safe at home, they will hide it very quietly. In in the name of people, some corrupt officials hid money under the bed and stuffed it into the wall. At that time, I believe many people were shocked to see the hundred-dollar bill on the wall. Those corrupt officials in ancient times knew that a pile of gold, silver and jewels was unsafe to keep at home, so they had to hide it cleverly so that no one could find it, so they hid it in the wall. Some corrupt officials are not at ease, so they dig tunnels themselves, or build secret warehouses themselves, and hide all their money in them, so outsiders can't know. You see in those TV dramas, it is obviously common for that corrupt official to do the same thing without a secret passage or a safe at home, saying that he wants to dig three feet deep.
Of course, it is not convenient for a pile of gold, silver and jewels to enter and leave. You see that local tyrant has a lot of cash with him now. Of course, converting money into some land titles and antique treasures is not only convenient for outsiders to detect, but also can preserve the value. From the current point of view, it is also an investment.