An increase in the marginal propensity to save from .1 to .2 will cause

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The marginal propensity to save is the fraction of each additional dollar of income that is saved instead of spent. An increase in the marginal propensity to save means that people are now saving a higher percentage of their income, thus spending a lower percentage of their income. This leads to a lower multiplier because the higher the marginal propensity to save, the lower the multiplier. This means that a given change in autonomous consumption will have a smaller effect on output, as the multiplier will be lower.

An Increase in the Marginal Propensity to Save from