Yesterday a lot of people bought ETH because many ETH-based tokens were launched and automatically the interest of people to buy ETH was very large which finally ETH could reach the highest price and different from this year there were too many negative news about ETH-based ICO and the issue that social media decided to ban ICO which greatly affected the price of the ETH, after this negative news I think people started selling their ETH which caused the price to plunge freely. the conclusion is that the price of ETH is strongly influenced by the current market trend.