成功的家庭理财不仅在于“增收”，还在于“节支”，即对家庭支出的管理。运用经济学中的“边际原理”，可以帮助您管理好家庭支出。 人们消费商品是为了满足某种需要，这种需要的满足，经济学家称之为“效用”，效用总是和稀缺联系在一起。同样一杯水，在沙漠中意味着生命，而 Successful family finance is not only about “increasing income” but also about “saving expenses” - the management of household expenses. Applying the “marginal principle” in economics can help you manage your household expenses. When people consume goods to meet a certain need, the satisfaction of such needs is what economists call “utility,” and utility is always associated with scarcity. The same glass of water means life in the desert