# In an Economy, Investment Increased by 1,100 and as a Result of It Income Increased by 5,500. Had the Marginal Propensity to Save Been 25 Percent, What Would Have Been the Increase in Income? - Economics

Short Note

In an economy, investment increased by 1,100 and as a result of it income increased by 5,500. Had the marginal propensity to save been 25 percent, what would have been the increase in income?

#### Solution

In an economy, if the investment increased by 1,100  and had the marginal propensity to save been 25 percent, then the increase in income can be calculated as follows:

"k" = (1)/"MPS" = (Δ"Y")/(Δ"I")

"k" = (1)/(0.25) = (Δ""Y")/(1100)

or, (1)/(0.25) = (Δ"Y")/(1100)

So, ΔY = 4,400

Thus, we can observe that an increase in the investment by Rs 1,100 will result in an increase in income and output by Rs 4,400.

Concept: Consumption Function and Propensity to Save
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