Price manipulation is done by using many ways.Publishing speculative news in favour of boosting bullish trend is a way.Here on the below link,we could see that news sites continuously release news that bitcoin price is to boom.If we see such moves,we should be cautious about investing otherwise we may get fooled and we might have to regret for our wrong investment.Don't let news media to decide your fortune.
https://www.reddit.com/r/Bitcoin/comments/9dimq2/headlines_two_days_ago_this_is_how_market/If a lot of investors invest on that certain currency, the price will drop. But if they withdraw all of it at the same time, the price will immediately rise. The pri e manipulation differs on how much invest that was happened on the currency. Sometimses, other companies store their currencies for them to invest it in the future.