Beauty Contest
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Famous economist Keynes likened the investment made by experts to a newspaper poll in which voters choose the six most beautiful photos out of 100, and the prize is given to the one that is closest to the average preference of all voters. Each voter must choose a photo that they think best matches the preferences of other voters, rather than the one they think is the most beautiful.
Regarding stock investment, it is effective to choose stocks (photos) that many market participants (=voters) judge to be likely to rise in value (=be beautiful).
It might work well as a speculative market on its own, but it doesn't seem to work well when it needs to be a "good thing" like elections. I finally found the name for something I've been thinking about.