If autonomous consumption is greater than zero and the marginal propensity to consume is greater than zero, but less than one, the consumption function will first be above and then below the 45 degree line.

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The consumption function will initially be above the 45-degree line due to positive autonomous consumption, but as income increases, the slope (marginal propensity to consume) being less than one will cause it to eventually fall below the 45-degree line.

If Autonomous Consumption Is Greater Than Zero and the Marginal