Correlation Risk – failure to consider the correlation between changes in the exchange rate and the firm’s revenue can result in the hedge largely failing for a period of time. This is easier said than done, since correlations can be relatively stable and then abruptly change or even reverse during periods of high market stress. This was the case for Aracruz as the Real plunged and the firm’s revenue also decreased at the same time. One way to deal with the potential for changing correlation during market stress is to buy out of the money call options in order to create a hedge that responds in a nonlinear fashion and thereby better matches the changes in EBIT. Aracruz did the opposite – they sold call options which contributed in large part to the losses.