Probably best we agree to disagree on this one.
Sure thing, let's agree to disagree... If I may be cheeky, I should say that another reason why retail traders lose is their unwillingness to admit (first and foremost to themselves) when they're wrong
.
By the way if you had 10 yards of volume to trade and you were looking to make a directional play how would you enter your position without moving the market thus giving you a poor entry? For now let's all assume none of us has traded 10 yards and also that 10 yards would be enough to give a bad entry (in case anyone attempts another derail about how much moves the market - that's not the point)
Right, so, first and foremost, 10 yards is a lot, but not really egregious in the context of some of the larger end users (e.g. SAFE, CBs like the SNB or Norges Bank, as well as an occasional very large M&A deal). In such a context, it's very important to understand what you're trying to achieve.
For example, if I don't want my execution to move the market as I am trading, I might do what's known as a "drive-by" (very bad form). Otherwise, if I am a decent guy, I will slice the order up into smaller bits over time (either myself or ask a dealer to do this). There are many ways to do this, e.g. VWAP, TWAP, etc.
Occasionally, and this goes back to what I mentioned previously regarding M&A, a dealer who has to trade 10 yards actually doesn't care about the mkt impact. I think there was a relatively clear example some time in 2010 when Prudential was doing the rights issue to buy AIA. HSBC, which was one of the underwriters for the issue, went in and absolutely slaughtered cable. They simply didn't give a damn that they moved the mkt by a couple of big figures, 'cause the FX slippage was less than an afterthought, given the fees they were being paid (supposedly, the three lead underwriters shared $1bn in fees).