И ещё:http://forexaw.com/TERMs/Economic_terms_and_concepts/Business/l779_%D0%A4%D0%B8%D0%BD%D0%B0%D0%BD%D1%81%D0%BE%D0%B2%D0%B0%D1%8F_%D0%BF%D0%B8%D1%80%D0%B0%D0%BC%D0%B8%D0%B4%D0%B0_Financial_Pyramid