A Perfect World is a world in harmony with it's inhabitants. In a perfect world, the advantages of both Capitalist and Socialist systems would be nurtured. Capitalism is an incentivised system, and Socialism is a welfare system. While both systems have have their own advantages, neither is perfect. Just like some people like to work for themselves, others like to work for welfare of the community. While neither is sustainable by itself, these systems do complement each other, to the point of making each other sustainable.