g else, generating an opportunity cost. When you love someone, you inevitably sacrifice the chance to love another person. So there's no question of whether or not opportunity costs exist; it's a matt...轉碼失敗！請您使用右上換源切換源站閱讀或者直接前往源網站進行閱讀！ put in ninety percent of effort and labor but earn only ten percent of the profit. It's difficult to change this abnormal situation. Many who work in the record business either have no attachment or...