medium · LSAT Logical Reasoning

A city council member argues: our city's average resident income has risen by 10 percent over the past three years. This proves that the economic well-being of the majority of our citizens has improved significantly.

The reasoning in the argument is flawed because it:

  1. neglects the possibility that the city's cost of living has fallen during the same period.
  2. treats a statement about a group's average as though it described what is true for most members of the group.
  3. assumes the income gains resulted from city policies rather than from broader national trends.
  4. ignores that income is only one of several measures of economic well-being.
  5. concludes that no resident's income could have declined over the three-year period.

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