BHP 1.20% $41.98 bhp group limited

I'm curious, when you guys say theirs a big sell just gone...

  1. 216 Posts.
    I'm curious, when you guys say theirs a big sell just gone through or conversely big buy, how given for one to happen the other has to too!, what is it you can see that makes you label a trade as being one or the other? It confuses an ignoramous like me.
 
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