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订单流失衡与短期价格冲击

文章 arXiv papers · 作者: Rama Cont et al.

总结

本研究使用 NYSE TAQ 数据,考察限价单、市价单和撤单如何影响 50 只美国股票的短期价格。研究聚焦最佳买价和卖价处的订单流失衡,将该处供需变化合并为衡量买卖压力的指标。分析发现,订单流失衡与价格变化呈线性关系,市场深度越大,价格冲击越小。

据报告,这种关系对季节性模式具有稳健性,并且在不同股票和时间尺度上保持稳定。作者将线性模型和尺度关系与常见的价格变化和交易量之间的平方根关系联系起来。他们提醒,基于交易量的关系比基于订单流失衡的关系噪声更大、稳健性更低。这些发现描述了实证价格形成机制,但本身并不能证明某种交易策略或其盈利能力。

核心观点

  • 研究显示,最佳买价和卖价处的订单流失衡是短时间间隔内价格变化的重要驱动因素。
  • 价格变化与订单流失衡呈线性关系,市场深度增加时冲击减小。
  • 据报告,订单流失衡关系在不同股票、时间尺度和季节性影响下保持稳定。
  • 尺度关系将线性模型与价格和交易量的平方根模式联系起来。
  • 以交易量衡量的价格冲击比以订单流失衡衡量的冲击噪声更大。

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# The Price Impact of Order Book Events


# The Price Impact of Order Book Events









We study the price impact of order book events - limit orders, market orders and cancelations - using the NYSE TAQ data for 50 U.S. stocks. We show that, over short time intervals, price changes are mainly driven by the order flow imbalance, defined as the imbalance between supply and demand at the best bid and ask prices. Our study reveals a linear relation between order flow imbalance and price changes, with a slope inversely proportional to the market depth. These results are shown to be robust to seasonality effects, and stable across time scales and across stocks. We argue that this linear price impact model, together with a scaling argument, implies the empirically observed "square-root" relation between price changes and trading volume. However, the relation between price changes and trade volume is found to be noisy and less robust than the one based on order flow imbalance.

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。