Price discrimination is essentially a price difference. It usually means that when the supplier of goods or services provides different recipients with the same grade and the same quality of goods or services at the same time, different sales prices or charges are implemented between the recipients. standard. According to the above definitions, Which of the following are price discrimination:. ['Dealers sell 50% off seasonal products.', 'Telecom operators implement differentiated pricing for in-network and out-network calls.', 'A cinema in Beijing offers a 20% discount on fares for its members.', 'The price of four-star hotels in Hong Kong is higher than many four-star hotels in the Mainland.']