Even under more plausible scenarios envisioned by the researchers, in which external growers get on board to varying degrees, consumer prices would rise and EU agricultural imports decline. Though that would in turn boost domestic production, with exact numbers depending on producers' willingness to adapt. The findings lay out an unpalatable political choice for Brussels: Keep angry farmers' tractors off the streets, or hit consumers' wallets as they fulfill basic needs at the grocery store. In order to avoid leaving any residue on fruits and vegetables, producers would essentially have to stop using the substance in question. However, critics say it clashes with global trade rules, as it essentially imposes EU rules on foreign producers, which is known as a mirror clause.