medium · LSAT Logical Reasoning

Average household income in Greenville has risen steadily for the past five years. Therefore, most families in Greenville are better off financially than they were five years ago.

The argument's reasoning is questionable because it

  1. infers that a gain registered by an aggregate average must reflect a gain felt by most of the individual households composing it.
  2. treats how comfortably a family is able to live as a matter settled entirely by the size of that family's income alone.
  3. draws a firm prediction about the financial future awaiting Greenville families from nothing more than a record of past trends.
  4. neglects to identify the precise dollar figure by which the average household income across Greenville has climbed over the period.
  5. overlooks the possibility that the cost of living in Greenville rose faster over those same years than household incomes did.

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