Hi there catapult! In my half year reading, investing, and trading I have notice so many factors that affect the price change, which I think the top three are following: First, when popular people talk about bitcoin. Remember when Bill Gates that the bitcoin will hit the 10k mark, the price suddenly skyrocketed; then this JP Morgan CEO talk about that bitcoin is bubble, what follow is a huge dip. Second, when government prohibit the. When the news came out that China prohibit new ICO and further processing of cryptocurrency, it also came with a huge price drop. Third, company support to bitcoin. When CME announce the bitcoin future contract plan, it sure fire the next price hype. There are other factors like influential investor advice and emotions.