高频市场微观结构如何产生粗糙波动率
文章 arXiv papers · 作者: El Euch Omar et al.
总结
本文将高频交易行为与资产价格的两种已观察到的特征联系起来:收益与波动率相关的杠杆效应,以及波动率路径不规则的粗糙波动率。研究使用霍克斯过程建立微观价格模型,以表示相互依赖的市场事件集群。模型纳入市场内生性、无套利条件、买卖不对称,以及分批执行的大额订单(metaorders)。
作者证明,前三项特征长期会产生由带杠杆效应的赫斯顿随机波动率模型描述的行为。加入大额订单后,会得到同时具有杠杆效应和粗糙波动率的粗糙赫斯顿极限。这为市场微观结构如何促成常见波动率动态提供了理论解释。该结果基于模型:摘要确立了数学上的极限行为,但未描述实证检验,也未说明这些机制能够解释实际市场中多少已观察到的波动率。
核心观点
- 模型使用霍克斯过程表示相互依赖的高频市场事件。
- 市场内生性、无套利和买卖不对称共同产生带杠杆效应的赫斯顿型极限。
- 纳入大额订单后,会得到同时具有粗糙波动率的粗糙赫斯顿极限。
- 论文提供的是理论层面的微观结构解释,而非对其贡献的实证测量。
标签
全文
# The microstructural foundations of leverage effect and rough volatility # The microstructural foundations of leverage effect and rough volatility We show that typical behaviors of market participants at the high frequency scale generate leverage effect and rough volatility. To do so, we build a simple microscopic model for the price of an asset based on Hawkes processes. We encode in this model some of the main features of market microstructure in the context of high frequency trading: high degree of endogeneity of market, no-arbitrage property, buying/selling asymmetry and presence of metaorders. We prove that when the first three of these stylized facts are considered within the framework of our microscopic model, it behaves in the long run as a Heston stochastic volatility model, where leverage effect is generated. Adding the last property enables us to obtain a rough Heston model in the limit, exhibiting both leverage effect and rough volatility. Hence we show that at least part of the foundations of leverage effect and rough volatility can be found in the microstructure of the asset.
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