Sure but isn't that a bit of a chicken-egg question? Why doesn't that the Netherlands have a huge poor underclass? Perhaps it has something to do with education at all levels being practically free and having social safety nets to ensure people don't fall through the cracks of the system ending up being homeless/destitute. I can tell you btw we do have a significantly large underclass, they just don't live on the street or in crime ridden ghettos.