The correct answer is all of the above.
Here's a brief explanation for each point:
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It slopes upwards: The consumption function typically shows a positive relationship between consumption and income, meaning that as income increases, consumption also tends to increase.
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Its slope equals the MPC (Marginal Propensity to Consume): The slope of the consumption function represents the MPC, which is the change in consumption resulting from a change in disposable income.
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It represents the direct (positive) relationship between consumption spending and the level of real disposable income: The consumption function illustrates how increases in real disposable income lead to increases in consumption spending.
Thus, all statements are true regarding the consumption function.