EC140 Lecture Notes - Lecture 4: Consumption Function, Opportunity Cost, Autonomous Consumption

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15 Jan 2018

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Lecture 4 simplest short run macro model, jan 15, 2018. Gdp measured in expenditure is made up of: consumption investment, government purchases, net exports, ae = c + i + g + (x im) Autonomous expenditure does not change when income changes. Model with no taxes income is the same. For each additional dollar i get, how much do i save and how much do i spend. This is where we see autonomous and induced consumption split up. On avg, marginal propensity decreases as income rises. Poor people spend more on propensity than rich. If it is above the 45 degree line, savings is negative. When consumption is higher than income, savings is negative. Changes in interest rates: a fall in interest rates (normally) shifts the consumption function up, fallen int rates shift consumption function up, rise in int rates shift consumption function down. Expectations about the future: optimism about the future shifts the consumption function up, household optimism.

Related Questions

Question 1

Which of the following describes the relationship between the change in inventories and aggregate expenditure?

A.	Aggregate expenditure equals the change in inventories minus GDP.
B.	The change in inventories equals GDP divided by aggregate expenditures.
C.	Aggregate expenditures equals GDP divided by the change in inventories.
D.	Aggregate expenditures equals GDP minus the change in inventories.
E.	The change in inventories equals GDP multiplied by aggregate expenditure.

1 points

Question 2

Suppose the marginal propensity to consume is 0.80 and taxes decrease by $10 billion. Which of the following is true?

A.	Disposable income and consumption fall by $10 billion
B.	Disposable income and consumption rise by $10 billion
C.	Disposable income rises by $10 billion and consumption rises by $8 billion
D.	Disposable income falls by $10 billion and consumption falls by $8 billion
E.	Disposable income rises by $10 billion and consumption falls by $8 billion

1 points

Question 3

If aggregate expenditure at a particular level of income is less than output,

A.	output will increase
B.	output will decrease
C.	output will remain the same
D.	output will rise slightly and then level off
E.	we cannot determine what will happen to output

1 points

Question 4

The consumption function

A.	illustrates the relationship between real disposable income and real consumption spending
B.	illustrates the relationship between the price level and real consumption spending
C.	is the relationship between productivity and real consumption spending
D.	shows how real consumption increases when real disposable income decreases
E.	illustrates the relationship between real consumption spending and employment

1 points

Question 5

The focus of the short-run macro model is on the role of

A.	spending in explaining economic fluctuations
B.	labor in explaining economic fluctuations
C.	financial markets in explaining economic fluctuations
D.	output in explaining economic fluctuations
E.	resources in explaining economic fluctuations.

1 points

Question 6

If the output level is such that the aggregate expenditure line lies below the 45-degree line, which of the following is true?

A.	Aggregate expenditure is greater than output, so inventories will increase and output will be raised.
B.	Aggregate expenditure is greater than output, so inventories will decrease and output will be increased.
C.	Aggregate expenditure is less than output, so inventories will decrease and output will be raised.
D.	Aggregate expenditure is less than output, so inventories will increase and output will be lowered.
E.	Aggregate expenditure is greater than output, so inventories will increase and output will be lowered.

1 points

Question 7

If the marginal propensity to consume is 0.7, the expenditure multiplier is

A.	7.0
B.	0.7
C.	3.0
D.	3.3
E.	not determinable without additional information.

1 points

Question 8

Aggregate expenditure is the sum of

A.	all types of spending by households and firms
B.	spending and savings by households
C.	spending by households and governments on final goods and services
D.	spending by households, government, firms, and foreigners on final goods and services
E.	all spending and saving by households, firms, and governments

1 points

Question 9

If the marginal propensity to consume is 0.5 and disposable income increases by $10,000, by how much will consumption spending increase?

A.	$10,000
B.	$500
C.	$50
D.	$5,000
E.	$9,524

1 points

Question 10

When real consumption expenditure is plotted against real disposable income the resulting relationship is

A.	very weak.
B.	virtually flat .
C.	positive and very close to linear.
D.	negative and very close to linear.

indigognu668

The following is a model of a closed economy with nogovernment.
C = 44 + 0.6YD I = 12

where C = desired consumption expenditure (in billions of $), YD =disposable
income (in billions of $), and I = desired investment expenditure(in billions
of $).

a) What is autonomous C equal to?
b) What is induced C equal to if national income (Y) is 120?
c) What would happen to C if Y increased by 10?
d) What is the saving function equal to?
e) How can private saving (S) be negative? Explain.
f) What would happen to S if Y increased by 10?
g) At what level of Y is the average propensity to consume (APC)equal to 1?
h) How does the APC change as Y increases?
i) How does the average propensity to save (APS) change as Yincreases?
j) What is aggregate expenditure function equal to?
k) Is the economy in equilibrium when Y is 150? If no, then by howmuch are
the economyâs inventories changing?
l) What are the equilibrium levels of Y, C, S, and YD?
m) At equilibrium, what do the injections and the withdrawals inthis
economy equal?
n) Give two reasons why investment would change from I = 12 to I =18.
o) What are the new equilibrium levels of Y, C, S, and YD ifinvestment
changed from I = 12 to I = 18?
p) What is the size of the (simple) multiplier?
q) What is the change in Y in the 3rd round of the multipliereffect as a
result of the change in investment in part n?

harlequinseal728

On the planet Omicron Persei 8, government spending is $1000, net taxes are $1200, and planned investment is $1400. Consumers spend according to the equation C = 100 + 0.8Yd, where Yd represents disposable income. Given this information, fill out the table below to determine which of the output levels represents a macroeconomic equilibrium, then answer the questions that follow. Output (Income) Y Net Taxes T Disposable Income Yd Consumption C Planned Investment I Government Purchases G Planned Aggregate Expenditure AE Unplanned Inventory Change 6200 1200 5000 3850 1400 1000 6250 -50 6700 1200 5500 4225 1400 1000 6625 75 7200 1200 6000 4600 1400 1000 7000 200 7700 1200 6500 4975 1400 1000 7375 325 8200 1200 7000 5350 1400 1000 7750 450

An a. Which level of output is a macroeconomic equilibrium? There is no level of equilibrium based on inventory levels.

b. Is the government budget balanced, in deficit, or surplus, and by how much? Since the government is spending less than it is collecting in taxes, we are showing a surplus.

c. Find the marginal propensity to consume, and the marginal propensity to save. d. Find the government spending multiplier. If the government wanted to increase the equilibrium level of income by $1,000, how much would it have to increase government purchases? e. Find the tax multiplier. If net taxes were lowered by $100, what effect would it have on the equilibrium level of income? Give a specific numerical answer.

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EC140 Lecture Notes - Lecture 4: Consumption Function, Opportunity Cost, Autonomous Consumption

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