You could change amount of tax in each country to get the best possible income:
High Tax = More money from each person in population, but losses in population
Low Tax = Less money from each person in population, but high population.
Tax will be based on countries income
You have 10 choices of amount of tax: 1%, 2%, 5%, 10%, 15%, 20%, 25%, 33%, 50%, 100%.
With 100%, you are at a very high risk of losing all population.
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Some people like you, some people don't. In the end you just have to be yourself.