When I wrote full edge, it would be only in the case of a SPX crash below the short and not recovering at all, in that case if the S&P future is liquid enough to be sold at the short strike of your spread then no money is lost and in fact money is made as the money from the future will be greater than the money lost in the spread.
Now, if the stop-sell of the SP future is trigered and soon after the SPX start to climb again, then you are losing big money until you buy to close your future position.
No perfect edge, only one possible solution against fear of crash.
Now, if the stop-sell of the SP future is trigered and soon after the SPX start to climb again, then you are losing big money until you buy to close your future position.
No perfect edge, only one possible solution against fear of crash.