Krugman does entitlement slavery

Beyond that, DREAMers are young — which means that they help the economy in not one but two big ways, because they mitigate the economic problems caused by an aging population.One of those problems is fiscal: as the population ages, there are fewer working-age members contributing taxes to pay for Social Security and Medicare. A cohort of relatively high-wage, highly motivated people mostly in their 20s, likely to pay lots of taxes for decades, is exactly what the doctor ordered to make that issue less severe.

One might consider that the ideal situation  is a self replicating population, not a population that resorts to slavery every generation.