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Should voters in the UK have a final vote on the Brexit deal?
A referendum is expensive. It is risky to make one if there are good chances the result won't change. And based on how the government embraced Brexit, this is quite likely.
If the claims of the Remain campaign are to be believed, the result of not having the referendum will be far more costly than having it. The Cost of the referendum is largely irrelevant.
If the claims of the Brexit campaign are to be believed, the money saved by leaving the EU will make expenses for a new referendum irrelevant; it will pay for itself.