pyr·a·mid sell·ing
noun/ˌpɪrəmɪd ˈselɪŋ/
/ˌpɪrəmɪd ˈselɪŋ/
[uncountable]- a way of selling things in which somebody buys the right to sell a company’s goods and then sells the goods to other people. These other people sell the goods again to others.
金字塔式销售；宝塔式营销