Suppose you have stock X and Y that have a negative correlation so that when X rises, Y drops and vice-versa. Moreover, the net percentage move between them is less than 2% within a given period of time. For example, if X drops 4%, Y will rise no more than 6%. If X rises 5%, Y will drop at least 3%. It's impossible to know ahead of time which of X and Y will rise. Is there any option strategy that can leverage this fact? Shorting both X and Y would not be profitable because the net percentage is very often positive. Thanks.