Kaldor’s Non-linear Investment Function implies that
Marginal propensity to invest is small at both the high and low levels of economic activity
Nicholas Kaldor's trade cycle model (1940) replaces linear saving and investment functions with non-linear, S-shaped ones.
At low levels of economic activity there is a lot of idle capacity, so a rise in income induces very little extra investment. At high levels of activity, rising construction and borrowing costs and scarcity of resources also make investment respond weakly to income.
Only in the normal (middle) range does investment respond strongly to income. So the investment function is flat at both ends and steep in the middle: the marginal propensity to invest is small at both the high and the low levels of activity.
Combined with a saving function that is steep at the extremes, this gives multiple equilibria, with the middle one unstable, which generates cyclical movement of income.
Hence, the answer is Marginal propensity to invest is small at both the high and low levels of economic activity.
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