如何保存勞動之後，交換到的【貨幣購買力】，不會貶值，錢不會越來越薄？
money coins or notes (= special pieces of paper ) that are used to buy things, or an amount of these that a person has 貨幣;錢，金錢;財產 credit a method of paying for goods or services at a later time , usually paying interest as well as the original money 賒購，賒帳，信用貸款 liability the fact that someone is legally responsible for something （法律上對某事物的）責任，義務 asset something valuable belonging to a person or organization that can be used for the payment of debts 資產;財產 巴菲特對於投資計畫的一項原則：本金不能消失。 假如第一年投資虧損50%，請問投資第二年有報酬率達150%的項目？
