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Information and IdeasVery hardFinding weakening a claim about a tax

Information and Ideas practice question

A council claims that its new tax on sugary drinks caused a fall in the amount of those drinks sold in the town.

Which finding, if true, would most directly weaken the council's claim?

  1. A. Sales of sugary drinks fell by the same amount in neighbouring towns that introduced no tax, after a national campaign against sugar.Correct
  2. B. Shopkeepers in the town say the tax is unpopular.
  3. C. The price of sugary drinks in the town rose after the tax.
  4. D. Sales of sugar-free drinks in the town rose over the same period.

Answer: A. Sales of sugary drinks fell by the same amount in neighbouring towns that introduced no tax, after a national campaign against sugar.

If sales fell equally where there was no tax, the fall has another cause — the campaign — and the tax isn't needed to explain it.

Why the other answers are wrong

B. Shopkeepers in the town say the tax is unpopular.
Unpopularity doesn't bear on whether the tax caused the fall.
C. The price of sugary drinks in the town rose after the tax.
A price rise is how the tax would work; it supports the claim.
D. Sales of sugar-free drinks in the town rose over the same period.
A switch to sugar-free drinks is consistent with the tax working.

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