Dude, I have probably traded more XMR in Poloniex than you. I am saying that there are certain practical limits for entering/exiting a position and one is that if you don't normally have trading volume, and suddenly want to buy/sell a higher % of the daily volume than 5%, it affects the price. You can try it safely any time by deciding a 2-week period, and trying to buy/sell 70,000 XMR at a better price than the weighted average during the time.
You can't do it.
As for the rest of my post, I am trying to bring the voice of reason and introduce scenarios that have let's say at least a 50% chance of actually having happened last summer. The others can bring in the theoretical edge cases, if that's their speciality.
Of that I have no doubt. But hang on I thought you didn't sell any
In general and weighted over 2 weeks I agree with you. During the 1000btc volume days however it certainly was possible to exit 5% of the daily volume over the weighted average for that day. I've done it!
And it is irrefutable that it was possible to sell more than 6k XMR over 0.00865, again I did it. The average is not weighted by volume. 99% of the daily volume could have been at 0.009 and above. With a daily candlestick it is not possible to tell, it is only possible to tell what the average price on that day was, the open, close, highs and lows.
He sold at 0.0058.