What is the definition of the marginal propensity to consume?

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Overall expenditure divided by total consumptionTotal consumption divided by total earningsThe change in consumption divided by the change in incomeThe change in consumption divided by the change in savings

Explanation

The marginal propensity to consume (MPC) measures how much consumption changes in response to a change in income. It is calculated as the ratio of the change in consumption to the change in income.