What is the proportion of saved disposable income called?

The proportion of saved disposable income called "savings rate".

A savings rate is the measure of cash, expressed as a rate or proportion, that a man deducts from his dispensable individual pay to set aside as a savings or for retirement. The money accumulated is commonly put into generally safe ventures (contingent upon different factors, for example, expected time until retirement), like a currency advertise finance or an individual retirement account (IRA) made out of non-aggressive shared assets, stocks and bonds.  

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"the importance of the japanese economy and security is far greater than that of the asian values"