少点错误 2024年08月01日
Ambiguity in Prediction Market Resolution is Still Harmful
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文章探讨了委内瑞拉总统选举在预测市场中的情况,包括Polymarket等市场的结果及存在的问题

🎯Polymarket的'委内瑞拉总统选举获胜者'市场存在争议,马杜罗政府宣布几乎肯定是伪造的选举胜利,反对派则公布了更可信的结果,该市场目前处于争议状态,且有3546397美元的投注

👍Manifold的相关市场明确表示'解决于CNE宣布的委内瑞拉2024年总统选举的获胜者(即马杜罗)',表现较好

🤔Metaculus的市场描述基于委内瑞拉国家选举委员会或其他可靠来源的官方结果发布,虽有一定问题,但也将结果判给了马杜罗

💡文章指出委内瑞拉选举对世界并非十分重要,且其腐败问题众人皆知,预测市场在处理稍复杂或有争议的问题时存在不足

Published on July 31, 2024 8:32 PM GMT

A brief followup to this post in light of recent events.

Free and Fair Elections

Polymarket has an open market 'Venezuela Presidential Election Winner'.  Its description is as follows:

The 2024 Venezuela presidential election is scheduled to take place on July 28, 2024.

This market will resolve to "Yes" if Nicolás Maduro wins. Otherwise, this market will resolve to "No."

This market includes any potential second round. If the result of this election isn't known by December 31, 2024, 11:59 PM ET, the market will resolve to "No."

In the case of a two-round election, if this candidate is eliminated before the second round this market may immediately resolve to "No".

The primary resolution source for this market will be official information from Venezuela, however a consensus of credible reporting will also suffice.

Can you see any ambiguity in this specification?  Any way in which, in a nation whose 2018 elections "[did] not in any way fulfill minimal conditions for free and credible elections" according to the UN, there could end up being ambiguity in how this market should resolve?

If so, I have bad news and worse news.

The bad news is that Polymarket could not, and so this market is currently in a disputed-outcome state after Maduro's government announced an almost-certainly-faked election win, while the opposition announced somewhat-more-credible figures in which they won.

The worse news is that $3,546,397 has been bet on that market as of this writing.

How should that market resolve?  I am not certain!  Commenters on the market have...ah...strong views in both directions.  And the description of the market does not make it entirely clear.  If I were in charge of resolving this market I would probably resolve it to Maduro, just off the phrase about the 'primary resolution source'.  However, I don't think that's unambiguous, and I would feel much happier if the market had begun with a wording that made it clear how a scenario like this would be treated.

How did other markets do?

I've given Manifold a hard time on similar issues in the past, but they actually did a lot better here.  There is a 'Who will win Venezuela's 2024 presidential election' market, but it's clear that it "Resolves to the person the CNE declares as winner of the 2024 presidential elections in Venezuela" (which would be Maduro).  There are a variety of "Who will be the president of Venezuela on [DATE]" markets, which have the potential to be ambiguous but at least should be better.

Metaculus did (in my opinion) a bit better than Polymarket but worse than Manifold on the wording, with a market that resolves "based on the official results released by the National Electoral Council of Venezuela or other credible sources," a description which, ah, seems to assume something about the credibility of the CNE.  Nevertheless, they've resolved it to Maduro (I think correctly given that wording).

On the other hand, neither of these markets had $3.5M bet on them.  So.

What does this mean for prediction markets?

This is really nowhere near as bad as this can get:

How would current prediction markets do in the 2000 Bush-Gore election?  Or, more to the point, how will they do the next time something even slightly unexpected happens, when it turns out that their wording did not quite predict it?

And when that inevitably happens, will there be tens of millions of dollars invested in the question?

I don't support e.g. the CFTC decision to try to ban prediction markets entirely.  I think prediction markets are a potentially interesting tool.  But seeing things like this happen (over and over) makes me less and less optimistic about prediction markets as a way to resolve questions that are even slightly complicated or controversial.  And if you want prediction markets used broadly as a way of getting trustworthy information on complicated issues, I think you need to realize this as a major problem.



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委内瑞拉选举 预测市场 Polymarket Manifold Metaculus
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