Herding and Liquidity in Order-Book Markets. II. Fundamental Anchoring and the Resilience of Liquidity

Jan Novotny

Papers from arXiv.org

Abstract: An order-book market whose liquidity provision is anchored to a fundamental value carries a restoring force: the price mean-reverts to value and the book refills after a shock. We show this restoring force is a robust intrinsic stabiliser and identify it causally-dialling the anchor down removes the mean-reversion, and a leverage-driven fire-sale then self-sustains. Separately, we ask whether a stressed market transmits its liquidity stress to a coupled calmer one, and find that it cannot: across six transmission channels of increasing strength-cross-market herding, arbitrage flow, and market-maker withdrawal up to a funding-constrained population fire-sale and a leverage spiral-the receiver's stress is independent of whether its neighbour is stressed, at every anchor strength. Market-maker withdrawal thins the receiving book but does not ignite it. Our order parameter throughout is the one-sidedness of the book-liquidity stress rather than a directional price crash-so a liquidity crisis here means the sustained one-sidedness a failing anchor produces. A liquidity crisis in this model is a failure of fundamental anchoring, not of market making.

Date: 2026-07
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