The realities of life can never be played out in a game. "The Supremacy" simulation tries to recreate the actual world, but cannot address all aspects of the real world accurately. First, countries are unique spheres of their own with their own situations and opinionated people. Army strategy is not laid out in the open for all countries to see. Though the game comes close to adequately addressing the economy issues it does not address that countries buy and sell from other countries and not to a world market where anyone can buy it. Finally, the most real aspect of the game itself was the actions and reactions of the players.
Each nation is made up of unique beliefs and cultures. These beliefs are the driving force of the government and how they make their decisions. In every democracy the people and their opinions are the driving force because the have the power to vote out the leaders of their country. A nation that has all the might and the money in the world cannot fight a war if the people will not commit to it and believe that it is the right course of action. This was the case for the United States in the Vietnam War. No President served more than one term in the span of Vietnam War because the people were not in favor of the war or the rising death toll.
Every nation also has some kind of weakness that makes it dependent upon another nation for various reasons that could be militarily or economical. An example of this is the United States dependence upon oil from the Middle East and having a military presence there to protect our interests. Countries do not all have the same technological capabilities. This again goes back to money because countries cannot afford to research this or even have the resources not to mention, to even be lucrative enough for a company to bring the technology to the country. The game cannot adequately address these concerns because the people playing the game are all essentially the same and the voice of six to ten people cannot compare to the voices of millions of people.