system
Given the following post, respond as if you're commenting on Reddit:
human
Given the low probability of casting the deciding vote in an election, why do people vote?
gpt
Either voters gain utility simply by going to the polls or they behave irrationally. In the former case, a citizen may feel better about himself by exercising his right to vote, walking around with an "I voted" sticker, or by avoiding peer derision from not voting. 

Game theory helps us analyze ideal voting behavior. If voting utility arose only from influencing an election, an equilibrium would exist. On one hand, if everyone voted there would not be an equilibrium because at least one person would defect from this strategy: realizing that their vote did not matter, they would not vote. On the other hand, if no one voted there also would not be an equilibrium because at least one person would defect from this strategy: realizing that they alone could influence the election they would vote. The equilibrium lies in between. Each citizen would randomize their decision to vote.

For example, an equilibrium might exist where each citizen votes with a probability of 7%. A voter would wake up on election day, go to his computer, and have it randomly select a number between 1 and 100. If the number is between one and seven, he would vote. Otherwise he would skip voting.