将市场冲击解释为对订单流失衡的预期
文章 arXiv papers · 作者: Thibault Jaisson
总结
本文提出一个模型,将大型母单的价格冲击与市场订单流动态联系起来。模型假设永久性冲击为线性,且价格遵循鞅过程,并在这些假设下推导价格如何随订单流变化。
对于近乎不稳定的霍克斯过程,该框架会产生持续的订单流方向,以及符合平方根定律的幂律冲击响应。文章还将带符号市场订单的持续性指数与冲击指数联系起来。这些是基于所述假设得出的理论含义,并非交易规则或直接测得表现的证据。该方法不要求交易者识别母单何时开始,但其结论取决于线性冲击和鞅假设。
核心观点
- 在永久性冲击为线性、价格遵循鞅过程的假设下,该模型根据市场订单流推导价格动态。
- 近乎不稳定的霍克斯过程可以产生订单方向的长记忆和幂律冲击函数。
- 推导出的冲击行为符合平方根定律。
- 该框架将带符号订单的长记忆指数与冲击函数指数联系起来。
- 分析不假设市场参与者能够检测母单的开始时点。
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# Market impact as anticipation of the order flow imbalance # Market impact as anticipation of the order flow imbalance In this paper, we assume that the permanent market impact of metaorders is linear and that the price is a martingale. Those two hypotheses enable us to derive the evolution of the price from the dynamics of the flow of market orders. For example, if the market order flow is assumed to follow a nearly unstable Hawkes process, we retrieve the apparent long memory of the flow together with a power law impact function which is consistent with the celebrated square root law. We also link the long memory exponent of the sign of market orders with the impact function exponent. One of the originalities of our approach is that our results are derived without assuming that market participants are able to detect the beginning of metaorders.
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