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Purchasing out-of-the-money call options would presumably allow Stone to cover his short positions at below-market rates in the event of a major rally. Doing nothing is a counterintuitive solution, but it has merit because of Campbell's investment strategy. In the event that unusual increases in stock prices overwhelm Stone's market-neutral model, Campbell's investments are likely to rise. Campbell's portfolio is not as concentrated as Stone's, but it does have some risk-reduction features in the context of Stone's portfolio. However, notional position limits on securities would be unlikely to help, because Stone's portfolio is concentrated in one sector, and in the situation portrayed above, all of the stocks moved in the same direction. When all of the stocks tend to move in the same direction, assigning limits to the size of each stock position will have little effect on the overall risk of the portfolio