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The quick version is that this happens because there were a bunch of sellers, they all sold their stuff and left. So now the buyers push the price through the PPZ, and the buy orders on the other side get filled (pushing price up more).
But each time, there are probably less and less sellers there. The rest already sold up, went home and made dinner. Eventually, price breaks through.Ignored
That makes sense now to say that the more a certain supportre/sistance area gets tested and the rejection is weaker from the previous time - the odds for a breakout grow.
Just a few things which passed through my head while reading this post.
Ben