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However, the price got from 140$ to 800$ not because of some mysterious "multi-year trend force" pulled it up, but because the Chinese speculators discovered bitcoin and bough it en masse; and it fell from 800$ to the present 350$ not because of some even more mysterious "correction force", but because the Chinese government policies have been driving most of those speculators away. It can't get more obvious than that.
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The price was already in an obvious uptrend when the Chinese speculators stepped in and pumped it, so instead of a peak of around 600$ in spring 2014,
the peak was around 1200$ in December 2013 (market moved a lot faster up with the Chinese). Events can heavily influence the market, but price affects price.