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1. Spend it (Consumption = C)
2. Save it (Saving = S)
3. Pay taxes (Taxes = T)
2. Save it (Saving = S)
3. Pay taxes (Taxes = T)
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three things to do with income (Y)
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C+S+T
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Income (Y)=
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Income available after paying taxes
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DISPOSABLE INCOME: Yd
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Y-T=C+S
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Disposable Income (Yd)=
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2
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How many things can you do with disposable income?
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1. Spend it (consumption = C)
2. Save it (saving = S)
2. Save it (saving = S)
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2 things you can do with disposable income
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Consumption Function
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Expresses consumption spending as a function of disposable income
Holding all other variables constant
Holding all other variables constant
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Wealth
Expected future income
Expected inflation rates
Level of interest rates
Expected future income
Expected inflation rates
Level of interest rates
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Other variables also influence the level of consumption
(4)
(4)
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WEALTH (OR NET WORTH):
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Value of what you own minus what you owe
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Income
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Amount you earn in a given time period
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wealth
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what you have saved over your lifetime
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income
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Consumption spending increases as ______ increases
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true
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The relationship between consumption and income is close to linear, t/f
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increases
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Slope of C = f(Y) decreases as income _____.
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increases
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Consumption spending (C) increases as GDP ________.
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consumption function for us economy
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C = f(GDP) = f(Y)
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GDP
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aggregate income (Y) in us economy=
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true
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Historically, the relationship has been almost exactly linear for the consumption function for us economy (t/f)
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true
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Frequently, we express C as a function of Y, rather than Yd for consumption function for us economy (t/f)
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autonomous consumption
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Intercept (value of C when Yd=0) represents:
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change in c/change in Yd
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Slope of consumption function=
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marginal propensity to consume
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slope of consumption function (change in c/change in yd) represents
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autonomous consumption
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Consumption spending that does not depend on the level of income (or GDP)
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autonomous spending
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Any spending that does not depend on the level of income or GDP:
Consumption
Investment
Government
Foreign spending
Consumption
Investment
Government
Foreign spending
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MARGINAL PROPENSITY TO CONSUME
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The proportion of an increase in income that is spent by consumers
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induced consumption
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the increase in consumption spending caused (or induced) by an increase in income
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intercept
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A change in the ______ causes the consumption function to shift parallel to itself with no change in the slope.
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-An increase in wealth, such as a rise in the stock market
-A decrease in interest rates which makes borrowing less expensive
-An increase in expected future income such as a job promotion
-A decrease in interest rates which makes borrowing less expensive
-An increase in expected future income such as a job promotion
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Some factors which can cause the consumption function to shift upward (3)
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Some factors which can cause the consumption function to shift upward
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-An increase in wealth, such as a rise in the stock market
-A decrease in interest rates which makes borrowing less expensive
-An increase in expected future income such as a job promotion
-A decrease in interest rates which makes borrowing less expensive
-An increase in expected future income such as a job promotion
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Average propensity to consume
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Total consumption spending/ Total income
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C/Yd
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APC=
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consumption
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The APC tells us the proportion of our entire disposable income that has been spent on _________.
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increase
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The MPC tells us the proportion of any _______ in our disposable income that will be spent on consumption
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decrease
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IF THE CONSUMPTION FUNCTION IS A STRAIGHT LINE, THE APC _______ AS Yd INCREASES.
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The line representing the consumption function
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shows the amount of desired consumption spending associated with any level of disposable income.
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true
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The 45 degree line is the locus of all points such that the value on the vertical axis equals the value on the horizontal axis. (t/f)
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45 line
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C=Yd where consumption function intersects the:
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exceeds income
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Suppose a point on the consumption function lies ABOVE the 45 degree line.
Then C > Yd.
This means that consumption ______ _______
Then C > Yd.
This means that consumption ______ _______
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low, dissave
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Suppose C exceeds disposable income
This tends to occur when income is _____.
These families _______.
This tends to occur when income is _____.
These families _______.
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exceeds, high
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Suppose a point on the consumption function lies BELOW the 45 degree line.
Then C < Yd.
Thus, income _______ consumption.
This tends to occur when income is _______.
Then C < Yd.
Thus, income _______ consumption.
This tends to occur when income is _______.
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equals, break even
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Suppose a point on the consumption function lies ON the 45 degree line.
Then C = Yd
This means that income ______ consumption.
These families just _______.
Then C = Yd
This means that income ______ consumption.
These families just _______.
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constant
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IF THE CONSUMPTION FUNCTION IS A STRAIGHT LINE, THE MPC IS ___________