In an economy , an increase in investment leads to increase in national income which is times more then the increase in investment. Calculate marginal propensity to consume.

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Correct Answer - Marginal Propensity to Consume (MPC) `=0.75`
Let increase in Investment `Deltal`
Then, increase in national income `=Deltal+3Deltal=4Deltal`
Investment Multiplier (k) `=("Increase in income")/("Increase in Investment")=(4Deltal)/(Deltal)=4`
We know, k `=(1)/(1-MPC)`
`4=(1)/(1-MPC)`
`1-MPC=(1)/(4)`
Hence , MPC `=1-0.25=0.75`

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