1.2 What is the Business Cycle?
By Ashton Winstead
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Last updated almost 2 years ago
28 Questions
Note from the author:
Lesson Details
Experience
Over time, all economies go through regular cycles of expansion and contraction. This is called the business cycle.
Today we’ll look at a graph depicting how Gross Domestic Product (GDP) changes with respect to time.
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Question 1
1.
What do you notice about this graph? What do you wonder?
What do you notice about this graph? What do you wonder?
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Question 2
2.
At each of the points A, B, and C, determine if GDP is increasing or decreasing.
At each of the points A, B, and C, determine if GDP is increasing or decreasing.
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Question 3
3.
The maximum and minimum values of a business cycle are called peaks and troughs.
The maximum and minimum values of a business cycle are called peaks and troughs.
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Question 4
4.
What can you say about the rate of change of GDP at these peaks and troughs?
What can you say about the rate of change of GDP at these peaks and troughs?
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Question 5
5.
Is GDP increasing and decreasing at a constant rate? Explain.
Is GDP increasing and decreasing at a constant rate? Explain.
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Question 6
6.
At Point D, GDP is increasing. Is the growth in GDP speeding up or slowing down? How do you know?
At Point D, GDP is increasing. Is the growth in GDP speeding up or slowing down? How do you know?
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Question 7
7.
When is GDP changing the fastest? How can you tell this from the graph?
When is GDP changing the fastest? How can you tell this from the graph?
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Question 8
8.
At Point E, is the slope of the curve negative or positive? What does this mean in the context of this problem?
At Point E, is the slope of the curve negative or positive? What does this mean in the context of this problem?
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Question 9
9.
At Point E, are the slopes increasing or decreasing? What does this tell you about how GDP is changing at this part of the business cycle?
At Point E, are the slopes increasing or decreasing? What does this tell you about how GDP is changing at this part of the business cycle?
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Question 10
10.
Describe what is happening at Point F with as much detail as possible.
Describe what is happening at Point F with as much detail as possible.
Formalize
What is concavity?
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Question 11
11.
Define concavity in your own words.
Define concavity in your own words.
A function is concave up if the rate of change is increasing.
A function is concave down if the rate of change is decreasing.
A point where a function changes from concave up to concave down or vice versa is called an inflection point, or point of inflection.
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Question 13
13.
Sketch a graph that meets the following requirements:
f(x) is decreasing and concave down for x<-2f(x) is decreasing and concave up for -2<x<0f(x) is increasing and concave up for 0<x<3f(x) is increasing and concave down for x>3
Sketch a graph that meets the following requirements:
f(x) is decreasing and concave down for x<-2
f(x) is decreasing and concave up for -2<x<0
f(x) is increasing and concave up for 0<x<3
f(x) is increasing and concave down for x>3
Tell me what each interval represents for the function.
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Question 14
14.
0 < x < 3
0 < x < 3
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Question 15
15.
(-∞,-1.5)
(-∞,-1.5)
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Question 16
16.
x>3.5
x>3.5
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Question 17
17.
(-1.5,1.5)
(-1.5,1.5)
Practice
The graph of a function f is shown.
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Question 18
18.
Is f increasing or decreasing at x = −1? How do you know?
Is f increasing or decreasing at x = −1? How do you know?
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Question 19
19.
Is the rate of change of f increasing or decreasing at x = −1? How do you know?
Is the rate of change of f increasing or decreasing at x = −1? How do you know?
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Question 20
20.
Approximately on which interval of the domain is the graph of f concave down?
Approximately on which interval of the domain is the graph of f concave down?
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Question 21
21.
On which interval of the domain is the graph of f concave up?
On which interval of the domain is the graph of f concave up?
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Question 22
22.
Estimate the x-value of the point of inflection.
Estimate the x-value of the point of inflection.
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Question 23
23.
Describe what this point tells you about how f is changing.
Describe what this point tells you about how f is changing.
Values for the rate of change of f at the 5 values given in the table below are -4.25, -3, 1, 4, and 9.75.
Fill in the table below to match each rate of change with the x-value where it occurs.

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Question 24
24.
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Question 25
25.
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Question 26
26.
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Question 27
27.
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Question 28
28.