A horizontal LM curve implies that the expenditure multiplier, when compared with the simple Keynesian expenditure multiplier, is

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A horizontal LM curve means that the interest rate does not change regardless of changes in income, which results in a constant level of investment. Therefore, the simple Keynesian expenditure multiplier is applicable and the expenditure multiplier is equal, regardless of changes in income levels.

A Horizontal LM Curve Implies That the Expenditure Multiplier, When