Process of core-periphery polarisation is sometimes repeated at larger spatial scales.
A core-periphery pattern has been fuelled by free movement of labour and capital within the EU.
The EU core of northern France, the Netherlands, Belgium and westernGermany includes the world cities of Paris, Brussels and Berlin. Economic migrants from eastern and southern Europe flow towards this core.
Internal national border controls within most of the EU were removed in 1995 when Schengen Agreement was implemented.
Schengen Agreement enables free movement of people and goods within the EU, meaning that passports and good declarations are not required at borders.
Eastern European nations implemented the agreement in 2007-2008.
Schengen Agreement is beneficial as EU labour can move to where there is most demand. However, there is also costs a once someone is in one EU country, they can move to others.
In recent years, most EU states have witnessed growth of nationalist movements opposed to free movement such as National Rally in France the the AfD in Germany.
Racistattacks and hostility towards immigrants are becoming an increasingly common problem in Italy, Germany and other EU countries.