Medical and long-term care expenses outweighs by a large margin the loss of consumption or tax revenue for retirees, especially for a welfare state like Germany. Many studies in Germany have showed exactly this constellation of cost-benefit.
I wonder how many move back to Germany when fragile though. requires citizenship though? unless your permanent residency stays valid when you move abroad.
what would I have to use as search terms on Google scholar to find the many studies?
if you retire abroad you spend the pension abroad. that's a net loss for the nation.