Mean Reversion, Stochastic Process.
average than either x=2 or x=-2 Move to some finite x<-2, even though that’s worse than x>2 by symmetry Move back to x=-2 even though that’s worse than x=2 Move to somewhere in between x=-2 and zero even though that’s worse than (0,2) by symmetry Move to zero.. call this Option A Move to somewhere