Predictions are certainly different from objective facts, but this idea that people coming together and sharing their judgments can lead to more accuracy is interesting to consider in the context of political polling.
The question, 'Who would you vote for...' is very different from 'Who do you think will win?' This may be part of the reason the prediction markets have been getting a lot of attention.
Another potential downside to asking people directly who they will vote for is that they might not be honest. This was one explanation for what went wrong in the 2016 polls.
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