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$370 就能操纵一個預測市場的價格。
LessWrong 上一篇文章拆了幾個案例:Scott Alexander 引用 Polymarket 上 Anthropic 估值市場,說「市場認為 90% 概率會達到 $500B」。作者去翻了 orderbook,YES 那邊總深度只有 $370。花這點錢就能把價格從 90% 砸到 76%。
更離譜的是同一個事件,Kalshi 顯示 37%,Polymarket 顯示 22%。差了 15 個百分點,因為兩邊流動性都差到沒有參考價值。還有 Manifold 上的市場,整整一周零交易,照樣被引用。
自己在 Polymarket 交易的體感也是這樣 — 很多市場看著有個價格,但掛單薄到一筆幾十美元的交易就能把價格推好幾個百分點。價格存在和價格有意義是兩回事。
原文值得一讀: