少数者博弈的信息效率如何影响大额订单冲击
文章 arXiv papers · 作者: Andre Cardoso Barato et al.
总结
本研究考察大型交易者在有限时段内持续买入或卖出对少数者博弈市场冲击的影响。大额订单会改变市场环境并创造统计套利机会,促使其他交易者调整策略。分析将市场信息效率与执行大额订单的成本和持续性联系起来。
报告结果取决于模型的平稳阶段。在不可预测且信息有效的阶段,永久冲击为零;在可预测阶段,永久冲击不为零,并随大额订单规模线性增加。作者采用无序系统的统计力学方法刻画可预测阶段,将执行成本与响应函数联系起来,并推导出精确的永久冲击结果。这些结论是少数者博弈框架内的理论结果;说明未提供实证市场验证,也未说明模型各阶段与实盘市场的对应程度。
核心观点
- 有限时长的大额订单会扰动少数者博弈市场,并促使其他交易者调整策略。
- 据报告,在不可预测阶段,永久冲击为零。
- 在可预测阶段,永久冲击不为零,并随订单规模线性增长。
- 统计力学方法将执行成本与市场响应函数联系起来。
- 所述发现来自理论模型,说明中未提及实证验证。
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# Impact of meta-order in the Minority Game # Impact of meta-order in the Minority Game We study the market impact of a meta-order in the framework of the Minority Game. This amounts to studying the response of the market when introducing a trader who buys or sells a fixed amount h for a finite time T. This perturbation introduces statistical arbitrages that traders exploit by adapting their trading strategies. The market impact depends on the nature of the stationary state: We find that the permanent impact is zero in the unpredictable (information efficient) phase, while in the predictable phase it is non-zero and grows linearly with the size of the meta-order. This establishes a quantitative link between information efficiency and trading efficiency (i.e. market impact). By using statistical mechanics methods for disordered systems, we are able to fully characterize the response in the predictable phase, to relate execution cost to response functions and obtain exact results for the permanent impact.
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