Based on the information given the multiplier, assuming there are no taxes or imports is 1.67.
Using this formula
Multiplier = 1 / ( 1 - MPC)
Where:
MPC=Marginal propensity=0.40
Let plug in the formula
Multiplier = 1 / ( 1 - 0.40)
Multiplier =1/.60
Multiplier = 1.666
Multiplier =1.67 (Approximately)
Inconclusion the multiplier, assuming there are no taxes or imports is 1.67.
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