Here's the correct matching:
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(A) Average propensity to save - (III) Always lesser than one:
- APS (Average Propensity to Save) is the ratio of total savings to total income. Since not all income is saved, APS is always less than 1.
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(B) Average propensity to consume - (IV) Can't be zero:
- APC (Average Propensity to Consume) is the ratio of total consumption to total income. People always consume something, even if it's a minimal amount, so APC cannot be zero.
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(C) Marginal propensity to save - (II) Ratio of change in consumption to change in income:
- MPS (Marginal Propensity to Save) measures the change in savings due to a change in income.
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(D) Marginal propensity to consume - (I) Inversely related to investment multiplier:
- MPC (Marginal Propensity to Consume) is the proportion of additional income that is consumed. The investment multiplier is inversely related to MPS (and therefore directly related to MPC). A higher MPC leads to a larger multiplier effect.
Therefore, the correct answer is (A)-(III), (B)-(IV), (C)-(II), (D)-(I)