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CA Foundation · Business Economics · Determination of National Income

In the Keynesian consumption function C = a + bY, where 'a' is a positive constant, what does the value of 'a' represent?

The constant 'a' is autonomous consumption: the spending that takes place even when income is zero, funded by past savings or borrowing. It does not depend on income. The income-dependent part is bY, where b is the marginal propensity to consume.

  1. AConsumption that occurs even when income is zeroCorrect
  2. BThe proportion of additional income that is saved
  3. CThe change in consumption per unit change in investment
  4. DThe ratio of total consumption to total income

Explanation

In C = a + bY, 'a' is autonomous consumption, the amount spent even when income is zero, financed by past savings or borrowing. The term 'b' is the MPC. The proportion of extra income saved is the MPS, which is 1 - b, so the second option confuses 'a' with the MPS.

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