Spending Multiplier
Terms and Concepts to Cover:
Disposable Income = Consumption + Savings
Average Propensity
Marginal Propensity
APC, APS (APC + APS = 1)
MPC, MPS (MPC + MPS =1)
Spending Multiplier Formulas: __1___ or
__1___
1-MPC MPS
Links between changes in Consumption and
Savings = Policy Goals
Disposable
Income
APC
(as a % or Fraction): The average of
what people will __________.
APS
(as a % or Fraction): The average of
what people will __________.
APC
+ APS will always = ______.
Marginal
Analysis: What happens when a new unit
is added?
MPC
= What % of new DI will people ___________.
MPS
= What % of new DI will people ___________.
MPC
+ MPS will always = ______.
The
Spending Multiplier Effect
Assume
new marginal income is created.
Example: tax cut.
Assume
that the tax cut averages a new $1000 of disposable income.
Assume
that the current MPC will be 90% and the MPS will be 10%.
Person
|
MPC
|
MPS
|
First to get the new $
|
|
|
Second to use that $
|
|
|
Third to use that $
|
|
|
Fourth to use that $
|
|
|
Fifth to use that $
|
|
|
Total So Far of the Original $1000
|
|
|
Notice: For each person getting a new $1000, several
consumption events
can
occur from that single amount of money.
How long will the pattern continue?
Economists use the Spending Multiplier Formula to estimate the number of
times the pattern will repeat before the amount shrinks to a point where new
spending stops. The formula is: 1/1-MPC, or 1/MPS.
Therefore,
if the MPC is .9, how many new dollars of consumption will be created if
society receives $1 million dollars?
________.
How
many new dollars of consumption will be created if the MPC is only .5?
___________.
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