the unemployment rate in the United States since 1975, where unemployment is defined as the percentage of

adults who want jobs and are looking for a job, but cannot find one. The points for the unemployment rate in

each year are plotted on the graph, and a line then connects the points, showing how the unemployment rate

has moved up and down since 1975. The line graph makes it easy to see, for example, that the highest

unemployment rate during this time period was slightly less than 10% in the early 1980s and 2010, while the

unemployment rate declined from the early 1990s to the end of the 1990s, before rising and then falling back

in the early 2000s, and then rising sharply during the recession from 2008–2009.
510 A • The Use of Mathematics in Principles of Economics

FIGURE A5 U.S. Unemployment Rate, 1975–2014 This graph provides a quick visual summary of unemployment

data. With a graph like this, it is easy to spot the times of high unemployment and of low unemployment.
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