If it is remitted to China, it is cash when it is exchanged, and if it is brought into China, it is cash. The buying price of cash refers to the exchange rate used by banks to buy foreign currency cash. Because banks have to bear higher costs after buying cash than buying cash. When you sell the cash to the bank, you sell your foreign exchange deposit in a foreign bank to the bank. This foreign exchange deposit was transferred from your name to the bank's name from the moment you sold it to the bank. As long as the bank does the corresponding accounting treatment, it can immediately get this foreign exchange deposit in a foreign bank and start calculating interest immediately.

If the bank buys cash, because the foreign currency cash can't circulate locally, it needs to be shipped abroad, not only can't get the deposit and interest immediately, but also have to pay the cost of keeping the cash. Only when the cash has accumulated to a sufficient amount can the bank transport these foreign currency cash abroad and deposit it in foreign banks. Banks can obtain foreign exchange deposits in foreign banks and start earning interest. The specific expenses that banks need to pay to exchange foreign currency cash include: cash management fee, transportation fee, insurance fee, packaging fee, etc. These expenses are reflected in the difference between the cash purchase price and the cash purchase price.

Suggestion: No matter from which angle, such as safety, convenience and affordability, it is better to send money to China.