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$370 就能操纵一个预测市场的价格。
LessWrong 上一篇文章拆了几个案例:Scott Alexander 引用 Polymarket 上 Anthropic 估值市场,说"市场认为 90% 概率会达到 $500B"。作者去翻了 orderbook,YES
那边总深度只有 $370。花这点钱就能把价格从 90% 砸到 76%。
更离谱的是同一个事件,Kalshi 显示 37%,Polymarket 显示 22%。差了 15 个百分点,因为两边流动性都差到没有参考价值。还有 Manifold 上的市场,整整一周零交易,照样被引用。
自己在 Polymarket 交易的体感也是这样 — 很多市场看着有个价格,但挂单薄到一笔几十美元的交易就能把价格推好几个百分点。价格存在和价格有意义是两回事。
原文值得一读: