Wrong the answers are all over forums but people choose the play...

Wrong the answers are all over forums but people choose the play conspiracy games and call it unfair. It is simply a algo order setting you can choose if you wish a algo to participate in opening or do a order in 1st half hour or any other period you set. It can even trade with a 2nd algo with same buyer seller and not fall foul of rules as both algos are acting independently!! . Could be setting a range , could be $ cost averaging etc etc so many options an dmethods.

So why do people use algo - to trade be that sell down or buy up etc etc that is trading / investing.

Everyone has access to algo through a broker you just have to choose right broker or ask etc etc.

All that matters is VWAP on a daily price as it is volume that moves market prices not one of tiny trades affecting opening or closing being used by technical traders to set a pattern formation that they can trade