Answer:
Given, \[\frac{MPC}{MPS}=\frac{3}{1}\] Let MPC be 3x and MPS be1x Also, MPC +MPS =1 \[\therefore \,\,\,\,\,\,\,\,\,\,\,3x+1x=1\,\,\,\,\,\Rightarrow 4x=1\] \[x=\frac{1}{4}=0.25\] Or \[MPS=x=0.25\]MPS =x=0.25 \[MPC=3x=3\times 0.25=0.75\] Now, change in income\[(\Delta Y)\]= Rs. 8,000 \[K=\frac{1}{1-MPC}=\frac{1}{1-0.75}=4\] \[K=\frac{\Delta Y}{\Delta I}\] \[\Rightarrow \,\,\Delta Y=\Delta I.K\] \[8,000=\Delta I\times 4\] \[\Rightarrow \,\,\Delta /=Rs.\,\,2,000\] So, investment in the economy should rise by Rs. 2,000. The economic value reflected is concern for increasing the productive capacity of the country.
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