brokerage          
noun  finance & economics specialized uk/ˈbrəʊ.kər.ɪdʒ/ us/ˈbroʊ.kər.ɪdʒ/ (also brokerage house)
 [ C ](外汇、股票等)经纪商 
an organization that buys and sells foreign money, shares in companies, etc. for other people
  an online brokerage 网上经纪商 
  [ U ](外汇、股票等的)经纪业;佣金 
the activity of buying and selling foreign money, shares in companies, etc. for other people, or the money that is charged for doing this
  The company's main activity is insurance brokerage. 这家公司的主要业务是从事保险经纪。