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一元现金放在家里,常年不用,若干年后仍然是一元现金。如果一元现金存入银行,一年以后就要变成大于一元的价值,这个大于一元的货币价值量叫货币增值。货币的增值就是货币的时间价值,也就是说若干年后一元货币价值,包括货币期初的自身价值和其因时间长短而异的增值量。如果一元商品放在仓库里若干年以后卖出去,价格不变,仍只是价值量一元的商品。假定银行年利率为10％,
One dollar cash is kept at home for a long time, but it is still a one-dollar cash after a few years. If one dollar cash is deposited into the bank, it will become a value greater than one dollar a year later. The amount of money greater than one dollar is called currency appreciation. The appreciation of money is the time value of money, that is, the value of a dollar currency after several years, including its own value at the beginning of the currency and its value-added value that varies with the length of time. If a dollar commodity is sold in a warehouse several years later, the price will remain unchanged, and it will still be only a dollar worth of goods. Assume that the bank’s annual interest rate is 10%.