I want to know what you think, what affects the bitcoin price, so we can find out when to sell and buy bitcoin, because now the bitcoin price drops again 
Bitcoin prices rise and fall because of the new people who invest and feel panic in the end they sell and get a loss, maybe that's one example for many reasons why bitcoin prices can go up or down. And it could also be because someone is manipulating bitcoin prices although it certainly will not be much worth it because it would be difficult to manipulate bitcoin prices.