The maximum expected change in GDP if Islandia's marginal propensity to consume (MPC) is 0.8 is: $150 billion.
First step is to find the Multiplier
Multiplier= 1/(1 − MPC)
Multiplier = 1/(1 − 0.80)
Multiplier= 1/0.20
Multiplier=5
Second step
Maximum expected change = 5 × $30 billion
Maximum expected change = $150 billion
Inconclusion the maximum expected change in GDP if Islandia's marginal propensity to consume (MPC) is 0.8 is: $150 billion.
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