this is a myth created in the last couple of weeks by the remain camp. in reality being out of EU means we can unilaterally cut tariffs. i cant understand how EU remainers can say with a straight face that EU will improve our trade with other nations when the entire purpose of the EU and its forebears is to create a protectist bloc and restrict trade from the rest of the world. example, the Raspberry Pi was originally intended to be manufactured wholly in the UK, unfortunatly the import tariffs on some components made that uneconomical, it was cheaper to have the boards made abroad before importing (on a lower tariff) for final assembly. this is to protect old barely economically functional component manufactuers in the EU, who can no longer produce components to the specification or quality required. the EU will not negotiate meaningful trade deals across the world, its not in its interest to do so.
This doesn't make any sense. In the first paragraph you're stating the EU only seeks to protect itself. In the last paragraph you claim the EU has no interest in negotiating meaningful trade deals. Make your mind up.