His point is that if people grow up in a country with a strong safety net (and enjoy the benefits of that upbringing), then move away to start businesses or earn money away from that country to avoid paying into the cost of that safety net, there might not be so strong a safety net when they plan to return.
Which makes perfect sense; if it happens at scale, how would that safety net survive?
Right now, the few who do this are free riders on a system everyone staying behind is supporting. It's not a problem if a thousand people leave Germany to go make money outside the German tax regime and then return in their old age, their system can absorb it.
What would happen if a fifth of the population did that? It might be harder to sustain that level of social services with that loss of tax revenue, i.e. payment for those social services.
Which makes perfect sense; if it happens at scale, how would that safety net survive?
Right now, the few who do this are free riders on a system everyone staying behind is supporting. It's not a problem if a thousand people leave Germany to go make money outside the German tax regime and then return in their old age, their system can absorb it.
What would happen if a fifth of the population did that? It might be harder to sustain that level of social services with that loss of tax revenue, i.e. payment for those social services.