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Major macroeconomic variables
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YUPie
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What are the factors of national income?
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GDP = C + I + Y + (X-IM)
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What is another way of saying GDP?
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Aggregate Expenditure (AE)
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What is the goal of this macromodel?
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Finding the relation between the general price level (P) and the national income (Y).
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Desired vs. Actual Variables
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Desired = Intended, planned, no subscript
Actual = actual, measured by NIEA
Actual = actual, measured by NIEA
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Autonomous Variable
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exogenous variable that doesn't depend on Y; not a function of Y; value is given
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Example of Autonomous Variable
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Exports; as they depend on foreign Y
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Induced Variable
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Endogenous variable that depends on Y, are a function of Y
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Example of Induced Variable
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imports; depend on Canada's Y
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What are our assumptions for this chapter?
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All ceteris paribus variables are held constant (wealth, expectations, interest rates)
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What is the relationship between disposable income (Yd) and desired income?
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Positive; direct
If disposable income goes up, desired consumption goes up.
If disposable income goes up, desired consumption goes up.
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Disposable Income (Yd)
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amount of income households receives after paying tax
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Permanent Income
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the amount of income expected overtime.
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What determines the amount of disposable income households decide to consume and the amount they want to save?
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1. Consumption Function
2. Savings Function
2. Savings Function
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Consumption
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Disposable income spent on consumer goods
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Savings
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Disposable income not spent for consumer goods.
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Consumption Function
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the relationship between consumption spending and disposable income
C = f(Yd, ceterus paribus)
C = f(Yd, ceterus paribus)
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"WEI" Variables
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ceteris paribus variables; wealth, expectations, interest rates, disposable income
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45 degree line on Consumption Function Graph
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where consumption equals disposable income at any point along that line (Y = C = E)
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Break Even Income point on Consumption Function Graph
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where Y = C (point in which you begin to save)
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Desired Expenditures also is represented by
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Consumption (E=C)
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Dissavings on Consumption Function Graph
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where Y = 0, C = a (a is negative savings; borrowing)
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Five Characteristics of Consumption Function
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1. Y increases and C increases at decreasing rate or constant.
2. Dis-savings
3. Breakeven Income
4. Desired Savings
5. MPC = slope
2. Dis-savings
3. Breakeven Income
4. Desired Savings
5. MPC = slope
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Slope of the Consumption Function (b)
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MPC = ΔC/ΔYd
Usually positive to represent the positive relationship between C and Yd.
Usually positive to represent the positive relationship between C and Yd.
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When C > Yd, what is the desired savings? (+ or -)
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Negative.
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When C < Yd, what is the desired savings? (+ or -)
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Positive.
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Consumption Function Equation
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C=a+bYd
a = dissavings
b = slope of consumption function = MPC
a = dissavings
b = slope of consumption function = MPC
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Average Propensity to Consume
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proportion of disposable income that households want to consume: C/Yd
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Marginal Propensity to Consume
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How much of 1 additional dollar of income gets spent: ΔC/ΔYd
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If the MPC is constant..
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the MPC is the same at any level of income.
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Disposable Income calculated by..
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C(onsumption) + S(avings)
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Relationship between Saving and Consumption Propensities
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APS + APC = 1, lowest can be 0
MPS + APC = 1, lowest can be 0
MPS + APC = 1, lowest can be 0
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Shifts in Consumption Function
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Movement along the curve = change in independent variable (Yd) (induced)
Shift of the curve = change in ceteris paribus variables (autonomous)
Increase in Consumption = Curve shifts up
Decrease in C = curve shifts down
Shift of the curve = change in ceteris paribus variables (autonomous)
Increase in Consumption = Curve shifts up
Decrease in C = curve shifts down
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Savings Function
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How to decide how much to save; parallel to consumption
Yd = C + S
Positive Yd = + Savings
Yd = C + S
Positive Yd = + Savings
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Consumption Calculated by
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a + b(Yd)
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Savings Calculated By
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=a + (1-b)Yd
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Which of the ceteris variables have a direct influence on Consumption?
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Wealth and Expectations
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Wealth is calculated by..
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Assets - Liabilities
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How do expectations have a direct relationship to consumption?
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When we are optimistic about the future, more consumption!
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Why does interest rates have an inverse relation to Consumption?
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ex.) Low interest rates, high consumption