Economist: ChesChem, a chemical manufacturer located in Chester, uses natural gas for its enormous energy needs. Currently, natural gas costs twice as much in Chester as it does in Tilsen. If the cost of natural gas in Chester becomes more than twice that in Tilsen, ChesChem will move its manufacturing operations to increases at all, ChesChem will move its manufacturing operations to Tilsen.
What this question is testing
Your task
Find the assumption the argument requires in order for its conclusion to hold.
Common trap
Answers that would help the argument but aren't strictly required (sufficient, not necessary).
Winning move
Negate each choice — the right one breaks the argument when negated.
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