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价格冲击如何随交易时间尺度变化

文章 arXiv papers · 作者: Michele Vodret et al.
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总结

本文比较了两种解释价格冲击的模型：平稳 Kyle 模型认为订单流传递基本面信息，传播子模型则认为交易通过逐渐衰减的冲击核影响价格。比较发现，这两种模型在高频下产生相同的价格动态，并将这种一致性描述为普遍的小时间尺度行为。

在更大时间尺度上，两者预测的总体冲击强度不同，这种差异与超额波动率有关。分析还描述了价格响应的变化：高频下，对带符号订单流的响应呈次线性；低频下，对订单流失衡的响应呈线性。这为调和微观结构研究发现与较长、具有宏观经济意义的时间跨度上常用的线性关系提供了一种方法。摘要未提供实证细节、参数估计或决定这种转变的条件，因此难以直接评估和实际应用。

核心观点

  • 平稳 Kyle 模型和传播子模型预测的高频价格动态一致。
  • Kyle 框架将订单流视为基本面信息，传播子框架则对交易的机械性价格冲击建模。
  • 两种模型的总体冲击强度不同，差距与超额波动率有关。
  • 价格响应在高频下呈次线性，在低频下呈线性。

标签

市场微观结构统计学高频交易
全文
# Do fundamentals shape the price response? A critical assessment of linear impact models


# Do fundamentals shape the price response? A critical assessment of linear impact models









We compare the predictions of the stationary Kyle model, a microfounded multi-step linear price impact model in which market prices forecast fundamentals through information encoded in the order flow, with those of the propagator model, a purely data-driven model in which trades mechanically impact prices with a time-decaying kernel. We find that, remarkably, both models predict the exact same price dynamics at high frequency, due to the emergence of universality at small time scales. On the other hand, we find those models to disagree on the overall strength of the impact function by a quantity that we are able to relate to the amount of excess-volatility in the market. We reveal a crossover between a high-frequency regime in which the market reacts sub-linearly to the signed order flow, to a low-frequency regime in which prices respond linearly to order flow imbalances. Overall, we reconcile results from the literature on market microstructure (sub-linearity in the price response to traded volumes) with those relating to macroeconomically relevant timescales (in which a linear relation is typically assumed).

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。