A broad overview. It’s how much economic value an immigrant from that region can be expected to generate. Taxes paid etc. With whatever Taxpayer funded services they can be expected to consume subtracted off the total.

The end result being immigrants from much of the rest of the world are a net drain on average.

With only really Europe, Parts of Asia (IE Japan, Korea, and parts of China), and or European dominated states. USA, Canada, Australia, New Zealand etc. Being net benefits. In that they can be reliably expected to generate more than they consume.

It can be broken down somewhat further. By nationality as one example. Much of the net benefit in Europe for instance is primarily focused around Western European nations. With Eastern Europe either breaking even or coming out behind depending on the exact country.

It’s broaching topics the post WW2 Zeitgeist deemed verboten and offensive to discuss. Topics that frankly are probably long overdue to talk about.

Only a couple countries have actually done the research and calculations. In part given the difficulty questions and prevailing Western Cultural Zeitgeist. This particular batch of data is I believe sourced from the Netherlands.