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Choosing the Appropriate Scale for Economic Data Visualization
An economist wants to create a chart to compare the long-term economic growth of two countries over a 50-year period. One country started with a very low level of economic output, while the other started with a high level. The economist is considering whether to use a vertical axis with a standard linear scale or a ratio (logarithmic) scale. Evaluate the advantages and disadvantages of each type of scale for this specific purpose. Which scale would you recommend and why?
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Figure 8.1: US Real GDP Per Capita (2000–2023), Comparing the 2008 and 2020 Recessions
Consider a line chart where the vertical axis is a ratio scale showing a country's output per worker, and the horizontal axis shows time in years. The line on the chart is visibly steeper between the years 2010 and 2015 than it is between 2000 and 2005. Based only on this information, what can you conclude about the average annual growth rate of output per worker during these two periods?
A country's economic output over time is plotted on a chart with a standard time scale on the horizontal axis and a ratio scale on the vertical axis. Match each description of the line's appearance on the chart to the correct interpretation of the country's economic growth rate.
An economic analyst is examining a chart that plots the real GDP of two countries, Country A and Country B, from 2000 to 2020. The chart uses a standard time scale on the horizontal axis and a ratio scale on the vertical axis. The analyst observes that the lines for Country A and Country B are two parallel, upward-sloping straight lines, with Country A's line positioned consistently above Country B's line. What does this observation imply about the economies of the two countries during this period?
Interpreting Economic Growth on a Ratio Scale Chart
Choosing the Appropriate Scale for Economic Data Visualization
On a chart where the vertical axis is a ratio scale, a straight, upward-sloping line indicates that the variable being measured is increasing by the same absolute amount in each time period.
Interpreting Growth Patterns on a Ratio Scale
Visualizing Company Revenue Growth
An investor is analyzing a chart showing a company's revenue over a 10-year period. The vertical axis of the chart uses a ratio scale, and the horizontal axis represents time. The investor observes that the line plotting the company's revenue is a perfectly straight, upward-sloping line. What is the most accurate conclusion the investor can draw from this observation?
An economist plots a country's real GDP per capita from 1990 to 2010 on a chart with a vertical ratio scale. The data shows that the average annual growth rate was consistently 4% from 1990 to 2000. From 2001 to 2010, the average annual growth rate was consistently 2%. Which of the following best describes the appearance of the line on this chart?