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Also lots of immigration from former colonies

It's pretty standard for people to work abroad for a couple of decades then retire back home to their birthplace and open a pastelaria (cafe). Sadly, the market is pretty saturated and the net contribution to the economy is not that high.

From personal experience there are a number of professionals at early stages in their careers that return but quickly they realise that the opportunities are still rather limited and reverse their decision within a few years.

The situation is changing, but slowly.

> From personal experience there are a number of professionals at early stages in their careers that return but quickly they realise that the opportunities are still rather limited and reverse their decision within a few years.

I don't see any of that.

The only people that came back, were those that went to Angola before the oil crash that halted the country.

> some will go back

If they get back. And will most probably leave their descendants back.