McKelvey's Chaos theorem suggests that in a situation of majority voting with three or more voters and at least two policy dimensions, nay policy outcome is theoretically possible, regardless of the initial policy status quo. In the real world, voters have multiple dimensions of interests that they do not only concern about their financial gains, but also concern about matters, such as health and environment; therefore, according to the Chaos theorem, any outcome in a democratic system using the majority voting rule is possible.
In addition, when the political parties do not know the median voter's interest for certain, the greater the noise is, the more extreme the political parties become. The noise could be caused by many factors, including social unrest, economic difficulties, and social discrimination. Furthermore, lobbyists are able to influence politicians' decision making.
The US politics reflects all the theorems mentioned above. The current president was an unexpected outcome, this might be the result of the Chaos theorem; there have been some extreme policies making, and even the president is a lot more extreme the previous ones, this could be caused by the noise in the American society; the gun control in the US is significantly affected by the NRA lobbyists.
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