Success should be measured by how many citizens a state acquires.

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With the elimination of borders in the world people and goods will be able to move freely. This incentivizes the regions/states to compete with each other. Since people will be able to travel to areas they would see as being of the most benefit to them (economically, socially, etc.) the states will have to compete for citizens to become viable amongst the other states in the world. By rewarding states for citizens, the game is further incentivizing competition abroad. This market model for citizenship would theoretically benefit the people, providing a setting where the people can truly vote with their feet benefit from such.