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Finland's population is 5.439 million, It may work for 2000 people but will it be workable and scale up to 10-million, 50-million or 100-million people? I believe the "square cube law comes into play.

Square cube law: https://en.wikipedia.org/wiki/Square-cube_law

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Why would the square cube law come into play here? I don't understand how it's related to this context.

Ooops. I should have referred to the Economies of scale rule instead. Perhaps 10-people could manage 2000 payouts whereas as the population grew to 200,000 or more regional offices and support staff would grow and inefficiencies would become more expensive.

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