Dear Sir
Sorry to inform you,but thema in both link's not direct related
to question of the author .
Was asked about difference of intraday trading
options with different exercise style american against
european ,where both are highly liquid . SP,DEX,LFT
/difference of ECN for underlying also /
To questions ,which was disscused in your thread ,you
can ask/he answer/
www.markdcook.com ,read A.Baird/Market maker/ Options market making .
If protection is first objective ,scalping second ,best is synthetic asset
Long SPY ,sell call and buy put with equal price ,which is independent from current underlying price .
IF underlying highly margined /sp,es/ short time volatility impuls can trigger margin call
