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Minimizing the Probability of Lifetime Drawdown Under Constant Consumption

Angoshtari, Bahman and Bayraktar, Erhan and Young, V.R., Minimizing the Probability of Lifetime Drawdown Under Constant Consumption (May 19, 2016). Insurance: Mathematics and Economics, Forthcoming. Available for download at SSRN: http://ssrn.com/abstract=2781963

“We assume that an individual invests in a financial market with one riskless and one risky asset, with the latter’s price following geometric Brownian motion as in the Black-Scholes model. Under a constant rate of consumption, we find the optimal investment strategy for the individual who wishes to minimize the probability that her wealth drops below some fixed proportion of her maximum wealth to date, the so-called probability of lifetime drawdown. If maximum wealth is less than a particular value, m*, then the individual optimally invests in such a way that maximum wealth never increases above its current value. By contrast, if maximum wealth is greater than m* but less than the safe level, then the individual optimally allows the maximum to increase to the safe level.”

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