What is the multiplier effect?

What relationship does the MPC bear to the size of the multiplier? The MPS? What will the multiplier be when the mps is 0.4, 0.6? When the MPS is 1, 1/2 and 0? HOw much of a change in the economy will result if business's increase their level of investment by 8 billion and the MPC in the economy is 4/5? If the... show more What relationship does the MPC bear to the size of the multiplier? The MPS? What will the multiplier be when the mps is 0.4, 0.6? When the MPS is 1, 1/2 and 0? HOw much of a change in the economy will result if business's increase their level of investment by 8 billion and the MPC in the economy is 4/5? If the MPC is 2/3?

Please help with these questions, thank you!
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