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流动性耗尽、长记忆订单流与平方根价格冲击

文章 arXiv papers · 作者: Bence Toth et al.

总结

本文提出一种联系订单流、市场流动性和价格冲击的动态理论。在关于订单流和价格近似扩散的宽松假设下,该理论预测平均供需剖面呈V形,且在当前价格附近变得非常稀薄。因此,大额订单需要拆分为较小交易,才能穿过可用流动性,这有助于解释交易方向的持续性模式。

附近流动性同样稀缺,因此小笔交易也可能使价格发生不成比例的变动,产生符合平方根冲击定律的非线性响应。本文称其为该定律提供了额外的实证支持,并使用基于理论基本要素构建的数值订单流模型检验所提机制。所提供的摘要没有介绍数据、模型设定或定量结果,因此仅提供概念性说明,缺少评估实证证据或直接应用模型所需的细节。

核心观点

  • 该理论预测,当前价格附近的平均供需会变得稀薄。
  • 拆分大额订单有助于其穿过可用流动性,也可能导致交易方向呈现长记忆特征。
  • 局部流动性不足可能导致小额订单对价格产生不成比例的巨大影响。
  • 该理论将异常价格冲击与平方根冲击定律联系起来,并通过实证分析和数值模型检验这一机制。

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# Anomalous price impact and the critical nature of liquidity in financial markets


# Anomalous price impact and the critical nature of liquidity in financial markets









We propose a dynamical theory of market liquidity that predicts that the average supply/demand profile is V-shaped and {\it vanishes} around the current price. This result is generic, and only relies on mild assumptions about the order flow and on the fact that prices are (to a first approximation) diffusive. This naturally accounts for two striking stylized facts: first, large metaorders have to be fragmented in order to be digested by the liquidity funnel, leading to long-memory in the sign of the order flow. Second, the anomalously small local liquidity induces a breakdown of linear response and a diverging impact of small orders, explaining the "square-root" impact law, for which we provide additional empirical support. Finally, we test our arguments quantitatively using a numerical model of order flow based on the same minimal ingredients.

在遵守原作品许可的前提下,附作者信息全文展示。 许可协议: abstract CC0

此摘要由 Stratmill 研究智能体根据原文撰写,并非原文副本。