دفاتر الأوامر مقابل نماذج AMM في أسواق التنبؤ
Prediction markets use one of two fundamentally different mechanisms to match buyers and sellers: a traditional orderbook, or an automated market maker (AMM). The choice shapes spreads, liquidity, and what kinds of markets can exist at all.
دفاتر الأوامر مقابل نماذج AMM في أسواق التنبؤ
Orderbooks: match-when-they-meet
Kalshi and Polymarket both use orderbook models. Buyers post limit orders ("I'll buy YES at $0.55 or below"), sellers post limit orders ("I'll sell YES at $0.57 or above"), and trades execute when a buy price meets or exceeds a sell price. In liquid markets this produces tight spreads (often one or two cents) and excellent price discovery. In illiquid markets the orderbook can be empty on one side, and you simply cannot trade at any price.
AMMs: algorithmic quotes
Automated market makers replace the orderbook with a smart-contract liquidity pool that prices shares using a mathematical formula. The most famous is Robin Hanson's LMSR (Logarithmic Market Scoring Rule), which always provides a quote, even in dead markets, and bounds the market maker's maximum loss. The trade-off: AMMs give worse prices on large trades because the curve moves against you with size.
Which is better?
For high-volume markets (elections, major sports, macro data) orderbooks win on spread and execution quality. For long-tail questions with few traders, AMMs are the only way a market can exist at all. Many modern platforms use hybrid approaches: an orderbook for the main flow with an AMM filling in when the book is thin.
أدلة ذات صلة في هذه السلسلة
ما هو الاحتمال الضمني في أسواق التنبؤ؟
لماذا تعني حصة "نعم" المتداولة بـ0.62 دولار احتمالاً ضمنياً ~62٪, ومتى تنهار هذه القراءة.
سلسلةما هو LMSR (قاعدة تسجيل السوق اللوغاريتمية)؟
الصيغة التي صممها روبن هانسون لأسواق التنبؤ، لماذا تحدّ الخسائر، ومن لا يزال يستخدمها.
سلسلةكيف تعمل السيولة في أسواق التنبؤ
لماذا السيولة هي أقوى مؤشر للدقة، وكيف تُتلاعب الأسواق الرقيقة، وماذا تعني "العمق" حقاً.