The Support and Resistance Line Method: An Analysis via Optimal Stopping

Vicky Henderson, Saul Jacka, Ruiqi Liu and Jun Maeda

Papers from arXiv.org

Abstract: We study a mathematical model motivated by the support/resistance line method in technical analysis where the underlying stock price transitions between three states of nature in a path-dependent manner. For optimal stopping problems with respect to a general class of reward functions and dynamics, using probabilistic methods, we show that the value function is $C^1$ (with respect to the corresponding scale function) and solves a general free boundary problem. Moreover, for a range of utilities, we prove that the best times to buy and sell the stock are obtained by solving free boundary problems corresponding to two linked optimal stopping problems. We use this to compute optimal trading strategies for several types of dynamics and varying degrees of relative risk aversion.

Date: 2021-03, Revised 2025-04
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