Theoretically, no matter what currency you use, ordinary shops also accept Hong Kong dollars because of the exchange rate and the identification of currency authenticity.
Hong Kong is a free port, and all currencies can be directly used for transactions, but only Hong Kong dollars are needed. Let's just say, for example, if you buy something in RMB, the merchant can refuse to accept your RMB, and you can choose whether to accept it or not. But if you give him Hong Kong dollars, even if he really wants to accept RMB, he can't ask you to give RMB, but it is necessary to accept payment in Hong Kong dollars. This is the mandatory nature of local currency.
In Hong Kong, it is very convenient to exchange RMB for Hong Kong dollars, and many mainlanders go to Hong Kong. Many merchants accept RMB payment, and many goods in supermarkets are also marked with RMB prices.
Hong Kong dollar or Hong Kong dollar is the legal tender of Hong Kong. According to the Basic Law of Hong Kong and the Sino-British Joint Declaration, Hong Kong's autonomy includes the right to issue its own currency. Its official ISO 42 17 abbreviation is HKD (Hong Kong dollars); The sign is Hong Kong dollars. The Hong Kong Monetary Authority, Standard Chartered Bank (Hong Kong) Limited, The Hongkong and Shanghai Banking Corporation Limited and the Bank of China (Hong Kong) Limited announced on July 20th that they would launch a new series of 20 10 banknotes. Hong Kong has established a linked exchange rate system linking the issuance of Hong Kong dollars to the US dollar. The US dollars held by the Exchange Fund provide support for the stability of Hong Kong dollar banknotes.