yes you did not listen attentively else you would have been in the position to call out his flawed approach.
Here is why:
a) If he enters a long AND short at 16995, and if price breaks out and people cannot get filled at anything below 17050 then his long will be in the money by 55 yen. His stop loss at 17030 would have triggered and he would have lost 35 yen on that trade. So his net pnl would be +20 yen. The exact same pnl as if he had placed a stop buy at 17030 and would by the time price reached 17050 be in the money by +20 yen. What is the difference? Only difference is that in the first scenario he paid commission 3 times (and would have to pay one more commission to close out his long later on), in scenario he paid 1 commission (and would also have to pay one more commission to close out his long later on). So, scenario 1 is inferior to scenario 2.
b) If markets jumped and despite his stop at 17030 he would have gotten filled at 10750 then the pnl profile is again be identical between scenario 1 and 2 except that his pnl would be zero in either scenario.
I still insist you do not understand what your friend is talking about and also do not understand that being long and short at the same time has zero economic benefit, at least none that is pnl related. I am glad this flawed "strategy" is not your cup of tea!
Of course he could place a stop buy. But as he does not know the direction of the move, he would
need to place a stop sell order too, tying up additional margin that could be used elsewhere.
While I personally do not need to use this tactic, it may be sound for some. And I can not agree
with you, being that you keep saying, that it makes no sense. Just given the fact that the brokers
offer this type of order placement means there is a demand for it, and likely in situations other
than the example I gave. And while slightly different in process, the exact same tactic can be
found in option trading, being a straddle. So, even though risky, this tactic is recognized as making
sense for some. True, the person I spoke of is using it mainly due to not being able to compete with
the speed of computer driven orders. But good, bad or whatever, even though it may make no sense to you, this tactic does exist. And commission is not a factor as it's so low here. In fact it's zero at some brokers!
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