Commission: Refers to brokers, agents and other intermediaries, the legal income obtained by introducing sales. According to the above definitions, Which of the following are commissions:. ['A dealer sells famous wine and gets the difference of 2 yuan between the ex-factory price and the wholesale price of each bottle of wine.', 'Xiaoqian is an employee of a futures company, and the company pays him 2,000 yuan per month.', "A supermarket sells cigarettes on behalf of an enterprise, and the enterprise pays 10% of the supermarket's turnover.", 'According to the introduction by the director of the Municipal Construction Bureau, Mr. Tian, the contractor, contracted a building. In return, Mr. Tian thanked Wang for 50,000 yuan.']