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You're right that obviously the amount of buying is always exactly equal to the amount of selling. What I mean is that there are more people selling than buying at a particular price which means that the price will drop until buyers are found.

Definitely ;)

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Moving the price just has to do with whether buyers or sellers are hitting the ask or the bid mostly. As bids get taken out (which are buy orders) lower and lower bids pop up and those fearing they may miss getting their lot sold, lower the ask.