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4. a. Explain the concept of the multiplier, and explain the role of the marginal propensity to save (MPS) in determining the
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1.a.Multiplier is the change in income due to Change in autonomous expenditure.

Multiplier=1/1-Mpc=1/MPS. Thus lower the MPS higher will be the multiplier

b. In three sector economy, multiplier=1/1-c+ct. Thus higher the tax rate lower will be the multiplier

c. If MPS=0.28 then multiplier=1/mps=1/0.28=3.57

slope of AE=MPC=1-MPS=1-0.28=0.72

when import and tax rate reduces the slope of AE to 0.57

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