The UK would not have a decision-making role if it were in a customs union with the EU.

According to Pascal Lamy, “reinstalling borders is costly and the fundamental equation of Brexit is how do we exit politically as much as possible but economically as little as possible.” However, the British government would have no say over new trade deals if it was in a customs union with the European Union.

He adds that participation in a customs union “implies a degree of homogeneity within the customs union on what the purposes of a trade policy are, which would mean the UK’s economic system would remain aligned with the EU economic system, which is precisely what the Brexiteers don’t want.”

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