medium · LSAT Logical Reasoning

The 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 majority of individuals gained simply because the group's mean figure went up.
  2. Disregards how steadily rising inflation may have quietly eroded the real purchasing power of these incomes.
  3. Assumes that a family's financial well-being is captured wholly by its measured household income figure.
  4. Uses observed past income trends to forecast what will happen to those same incomes in the years ahead.
  5. Presumes that not one family anywhere in Greenville saw any decline whatsoever in its income.

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