OK external barriers have declined as internal barriers have risen.
I’m going to lay down now. My head hurts.
I think it makes sense. Example: Italy wants to keep it’s car manufacturing sector alive, so it erects “non-tariff” barriers to prevent Fiat being overrun by the much larger German and French companies. Of course, now, Fiat is owned by a French company. I have read that the Italian PM has been venting, very loudly, about that French company bringing in Polish built cars, adorned with Italian flags.
Steve