It might fix it, but I think not directly. UBI alone won't fix the productivity-wage gap because giving everyone a flat grant isn't going to stop employers from

It might fix it, but I think not directly. UBI alone won't fix the productivity-wage gap because giving everyone a flat grant isn't going to stop employers from paying low wages. However, it will remove one bit of leverage employers have when negotiating low wages, that being threat of destitution, which hopefully would help get wages tracking with productivity again, as they should.