wrong logic anamy.
"let think buy and sell in the same price and same lot=0".
the reality is instead of buy and sell first, we do not take any position.->same+we don't pay spread at all.
(buy 1 + sell 1= 0)
1.when price goes 1.2910 for the first time, we sell for the first time.
(buy 1+sell 2= sell 1)
2. when price goes 1.2920 , we sell more lot than original bcs:
(buy 1 + sell 4= sell 3)
3.etc
and you will see the result is same+we don't cost spread.
this way if you want compare it with the original one.
+on the original, more margin can be use than this.(this hedging divide margin by two)
i wonder what hedging use for.