In re-reading the paragraph above, I realize that this is an impossible scenario.

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At the time of any policy decision, it is impossible to know which scenario will play out.

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But he stopped short of saying the scenario was impossible, adding that it "is well within the realm of physical law".

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If there were, it would be nearly impossible to conjure a scenario in which the concentrated, temporary benefits to a specific industry receiving protection were not overwhelmed by the costs of that protection on the broader economy.

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However, Kieran Daly, from the online aviation news service Air Transport Intelligence, told CNN that this scenario, while not impossible, is inconceivable.

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The third scenario remains highly unlikely, though not impossible.

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