AL Econ what mean of [MPS]?

MPS - the full name is Marginal propensity to save
You should find this term in Macro-economic.
The importance is that an individual savings rate as a proportion to his income. That means when a person earns $100, he can at most save $100 or less. Therefore the rate of MPS is between 0 and 1.
The higher the rate of MPS, the more the savings will be within this economy. In China, the MPS is so high, and in USA, the MPS is very low.

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marginal propensityto save= change in savings /change in income
It is a desire of saving. It tells us that how much of an additional unit of income people save.The assumption that the propensity to consume is between 0 and . It implies that the mps is also between 0 and 1. In the simple model( two sectors model), all disposable income is either consumed or saved by household.
It follows that the sum of the mpc and mps add up to 1.

2006-11-18 17:23:29 補充：
The assumption that the propensity to consume is between 0 and 1.

MPS=Marginal Propensity to Save = 1-MPC