pyramid selling
US /ˈpɪr.ə.mɪd ˌsel.ɪŋ/
UK /ˈpɪr.ə.mɪd ˌsel.ɪŋ/

1.
ピラミッド販売, ねずみ講
a system of selling goods in which people are paid to sell products, but are also paid for recruiting other people to sell them. This system is illegal in many countries.
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The company was shut down for engaging in pyramid selling.
その会社はピラミッド販売に関与したとして閉鎖された。
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Many people lost money in the pyramid selling scheme.
多くの人がピラミッド販売スキームで金を失った。