The OP is proposing a system where savings decays over time, which creates incentive to spend your money quickly while it has value, hence consumerism. This effect already occurs to an extent via the FED's target inflation rate of 2% per annum. This strategy can also cause malinvestment. A person or company is more likely to make riskier investments rather than a certain loss. These risks often lead to economic bubbles. I see what the OP is trying to accomplish, but it would likely lead to a turbulent economy.