Traditionally, people refer to currencies with stable or appreciating exchange rates as coins, and currencies with unstable or expected depreciation as soft coins. It should be noted that "soft" is not equal to "secondary". Soft coins and coins have their own advantages and uses.

It is of great significance to distinguish soft coins from coins. In international trade, if we can't get a zero-risk RMB pricing method, choosing a suitable soft currency or coin is also a good way to avoid exchange rate risk.

When signing an export contract, traders prefer to use coins as the pricing currency of the contract, so that after the payment is recovered, they can exchange for the domestic currency that was expected to depreciate relatively, and even make a big profit when the coins appreciate. When importing, traders prefer soft coins, because soft coins can be exchanged for more RMB in addition to capital preservation.