It ' s almost always represented as a one way streetBecause it typically is vastly favoured in one direction . People move where they can get a job or a better job . This can be seen even within the UK with the NorthSouth . If you have free movement between countries , it is likely that the going rate for unskilled or skilled labour is disparate enough that a significant minority of workers move to the country with the better going rate in particular fields . Polish farm labourers coming to the UK would be a good example . I don ' t know if that ' s a clear message , it ' s still early and I have yet to have my morning coffee . <| sep |> How so ? s the Law of Cycles still exists , Madoka is still god , literally everything is the same except for Homura ' s barrier encompassing the universe .