“默契交易”是一种原始的交易形式， 在我国南方一些少数民族中及世界其他一些地区都存在过。其形成原因不是通常所说的双方语言不通， 而是人类早期存在一种“同陌生人交往的禁忌”的观念， 进而产生同 “异人”直接接触的避讳 Tacit trading is an original form of trading that exists in some minorities in southern China and in other parts of the world. The reason for this is not that what is commonly referred to as the language barrier between the two sides but rather the concept of “taboos for social interaction with strangers” in the early years of humankind has led to the taboo of direct contact with “alien people”