The marginal propensity to consume is greater than zero but less than one.

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The marginal propensity to consume measures the change in consumption resulting from a change in income. It is always greater than zero because as income increases, people generally tend to spend more. However, it is less than one because not all additional income is consumed - some may be saved or used to pay off debt. According to the Keynesian consumption function, the marginal propensity to consume is assumed to be between 0 and 1.

The Marginal Propensity to Consume Is Greater Than Zero but Less