<i>"the ES and YM are VERY closely correlated. thus, there is no advantage in trading ES vs. YM yet several advantages trading YM (better spread)"</i>
Commonly flawed logic. The spread means zilch, unless a trader always exits at the extreme end of every move. Otherwise, the spread is absorbed in the price action after trades are exited.
In other words, the YM moves more than +40pts while the ES moves more than +4pts from entry to exit. A little more or a lot more, makes no difference. That is a $200 price move, each symbol. Ya with me?
The bid/ask spread is irrelevant... each trade made the same amount of money with no regard for spread. The spread was absorbed in the trade's overage of entry = exit span. We did not make $195 on the YM and $187.50 on the ES... we made +$200 on each.
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Second trade goes against us -1pt ES and -10pts YM, respectively. That is a loss of -$50 on each trade, period. Rare, very rare is the time when ES will move -1pt against while YM only moves -9 pts against. More commonly, both will overrun the stop by some margin to equal degrees.
The fallacy of bid/ask spread making a difference in eminis is exactly that... a fallacy. Over the course of 100 or 1,000 trades at random, it's nullified.
Now, if someone has a mechanical system-bot that trades one symbol better than another, so be it. For discretionary traders, that difference should be nil as we adapt to each symbol's very unique "language" on the chart.
I would trade the YM given no other choice, probably ahead of ER at this point. There's nothing wrong with it at all... but it holds zero statistical advantage over ES.
To each their own
