Average propensity to save
The average propensity to save (APS), also known as the savings ratio, is an economics term that refers to the proportion of income which is saved, usually expressed for household savings as a percentage of total household disposable income. It can be calculated gross or net; when calculated net, a deduction is made for the depreciation of fixed assets. The ratio differs considerably over time and between countries. The savings ratio can be affected by (for example): the proportion of older people, as they have less motivation and capability to save; the tax system, as it can encourage or discourage saving; the rate of inflation, as expectations of rising prices encourage people to spend now. The inverse is the average propensity to consume (APC).