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You have to include the beavers in your population in order to have proper per capita figures.

Including animals in economic estimates is famously difficult. After all, how much wood could a woodchuck chuck if a woodchuck could chuck wood?

It would be tricky to calculate though. How much do you put down for unpaid work by trees producing oxygen for example?

What would be the cost to do it artificially?

Italy, Spain and UK include some shadow economy