Expand your model of encouraging immigration vs a native population that hits its replacement rate alone over time (and I don't mean 10 years, longer).News flash: children take 18 years to grow up. whereas skilled immigrant workers can start work immediately. Governments don't wait to wait around for nearly 20 years in the hope of boosting the workforce.
Which is more sustainable? And don't just think about the country to which people emigrate, think about the country they emigrate from too.
It's a short term unsustainable solution fuelled by greed and laziness (in the nation in which people arrive to) and a lack of willingness to admit that the social safety net in this country isn't sustainable if the number of people required to support it is a multiple of the people dependent on it.
The ideal scenario is a population in which the ratio of dependants (tax consumers) and contributors (tax producers) is equal, and the period of time in which people spend as both categories, i.e. time spent as a child/OAP vs worker, is equal. At the moment people spend far too much time as dependants, due to life expectancy going up and retirement age not going with it. Also kids spend a lot more time in school than they used to.
Short-sighted solution? Fill the contributor section of society with people from abroad (let's ignore the effect this has to the balance of the system from which they leave - although that's an equally serious issue). This will lead to solutions in the short term, the support for the dependants. The problem is those contributors eventually become dependants. You needed more contributors than dependants, but now that larger chunk of contributors are now dependants, so you need even more contributors to support the previous set of contributors. This cycle spirals on and on. And it's partly why the population in this country continues to rocket.
Long term solutions (which are massively politically unpopular and that's why they'll never get implemented). Make state handouts at retirement age worse (encourage people to invest more for retirement, workplace pensions are a good start). Increase state pension age. Don't force kids to stay in school until 18, if you want to leave at 16, go for it. Stop making jobs that didn't used to need a degree, need a degree (nursing, policing, etc). Get the ratio of contributors to dependants around 1:1. Then have a steady population conveyor belt. Giving you a constant population. Also not to mention how much better this would be for the environment.
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