I guess I am confused then. If you are going long spy and short it's inverse with the same position sizes, wouldn't the returns on trade always be zero? I understand how hedging works, just not in this case
Yes, but today, for the second time this year they voted down the legislative framework...
http://www.forexlive.com/blog/2011/12/21/swiss-parliament-votes-down-negative-interest-rates-rtrs/