Portfolio Choice in Markets with Contagion
Princeton University - Department of Economics; National Bureau of Economic Research (NBER)
Thomas R. Hurd
McMaster University - Department of Mathematics and Statistics
March 26, 2015
We consider the problem of optimal investment and consumption in a class of multidimensional jump-diffusion models in which asset prices are subject to mutually exciting jump processes. This captures a type of contagion where each downward jump in an asset's price results in increased likelihood of further jumps, both in that asset and in the other assets. We solve in closed-form the dynamic consumption-investment problem of a log-utility investor in such a contagion model, prove a theorem verifying its optimality and discuss features of the solution, including flight-to-quality. The exponential and power utility investors are also considered: in these cases, the optimal strategy can be characterized as a distortion of the strategy of a corresponding non-contagion investor.
Number of Pages in PDF File: 33
Keywords: Merton problem, jumps, Hawkes process, mutual excitation, contagion, flight-to-quality
JEL Classification: G11, G01
Date posted: October 5, 2012 ; Last revised: March 27, 2015
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