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Optimal bubble riding with price-dependent entry: a mean field game of controls with common noise

Author

Listed:
  • Ludovic Tangpi

    (Princeton University)

  • Shichun Wang

    (Princeton University)

Abstract

In this paper we further extend the optimal bubble riding model proposed in Tangpi and Wang (Optimal bubble riding: a mean field game with varying entry times, 2022) by allowing for price-dependent entry times. Agents are characterized by their individual entry threshold that represents their belief in the strength of the bubble. Conversely, the growth dynamics of the bubble is fueled by the influx of players. Price-dependent entry naturally leads to a mean field game of controls with common noise and random entry time, for which we provide an existence result. The equilibrium is obtained by first solving discretized versions of the game in the weak formulation and then examining the measurability property in the limit. In this paper, the common noise comes from two sources: the price of the asset which all agents trade, and also the the exogenous bubble burst time, which we also discretize and incorporate into the model via progressive enlargement of filtration.

Suggested Citation

  • Ludovic Tangpi & Shichun Wang, 2024. "Optimal bubble riding with price-dependent entry: a mean field game of controls with common noise," Mathematics and Financial Economics, Springer, volume 18, number 5, February.
    • Handle: RePEc:spr:mathfi:v:18:y:2024:i:2:d:10.1007_s11579-024-00353-3
    DOI: 10.1007/s11579-024-00353-3
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    References listed on IDEAS

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