Conversely, a mass exodus of educated citizens emigrating from a country negatively impacts growth.
Do you? Here's a list of US companies founded by immigrants:
Google, Apple (2nd gen), Intel, Tesla, ebay, Yahoo
The New Zealand government really wants people to believe that we're experiencing 'economic growth'. But while they might be technically right, they're effectively wrong. Economic growth that is so much entirely from immigration that we're effectively in per-capita-GDP recession is not real, useful, good growth.
Here's per-capita GDP growth in New Zealand, showing that there is real growth after normalising for changes in population: https://www.google.com/publicdata/explore?ds=d5bncppjof8f9_&...
When you shave ~1% off to account for immigration, then shave off another ~1% for inflation and you can see the hidden recessions.
And then you get into where that economic growth is going, which isn't to the bottom 80% of society. The end result looks a lot like the US median household income: https://www.google.com/publicdata/explore?ds=c8op9mhgodplq_&...
There's no reason we shouldn't be growing much more quickly. But we're not going to do so in a neoliberal world. That's just not going to happen. Draining the wealth of society to a small group of people that spend little money just doesn't drive growth.
People can't spend and drive the economy when they're dirt poor.