Makers and Takers: The Economics of the Kalshi Prediction Market

Karl Whelan ()

MPRA Paper from University Library of Munich, Germany

Abstract: Since 2021, Kalshi has operated as the only federally licensed prediction market in the United States. Using transaction-level data on over 300,000 contracts, we provide the first systematic evidence on its pricing. Kalshi’s contract prices are informative and improve in accuracy as markets approach closing, but they display a clear favorite–longshot bias: low-price contracts win far less often than required to break even, while high-price contracts win more often and yield small positive returns. We interpret these patterns with a simple framework that reflects Kalshi’s quote-driven microstructure. Makers—relatively well-informed traders who post offers—seek positive expected returns but may be slightly over-optimistic, while Takers accept these offers. The model predicts distinct patterns of favorite–longshot bias for Makers and Takers, and the data confirm these predictions.

Keywords: Prediction Markets; Kalshi; Favorite-Longshot Bias; Market Microstructure; Bid-Ask Spreads (search for similar items in EconPapers)
JEL-codes: G14 G23 (search for similar items in EconPapers)
Date: 2025-09
New Economics Papers: this item is included in nep-mac
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Related works:
Working Paper: Makers and Takers: The Economics of the Kalshi Prediction Market (2025)
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Persistent link: https://EconPapers.repec.org/RePEc:pra:mprapa:126350

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