The price of Bitcoin has always been subject to rapid price fluctuations. With various conditions that exist then everything can happen so quickly. Now the price of Bitcoin is in a fairly stable condition and is seen trying to slowly increase. bitcoin really had experienced unsteady conditions and it affected the value of public trust. but now everything has run quite normal and now our job is to try to apply Bitcoin in various daily financial transactions. Because with all our support that will make Bitcoin have a much better price value.
Yes, moreover the first condition is based on the fact that it is a decentralized market, it is new and it is highly speculative at the moment with less usage for what it is meant to be used for. Very few people make use of bitcoin nowadays as what every new investor is just looking for now is to get rich quick. In this way, it is always going to be easy for the whales to drive in emotions into the market and take huge advantage of it as time goes on, which I am sure it is a way any smart investor will be looking forward to getting hold of these opportunities for their benefits.
for bitcoin there is no authority to take such actions and public view and confidence is a major factor for bitcoin price to change for good or bad and in last time that didn't happen in favor for bitcoin but it is changing for better
No one certainly have the authority to control based on the decentralized attribute you mentioned. However, when it comes to price manipulation, it is easy for the whales to do this as the market generally is speculative in nature and since what most people are looking for is to get rich fast, with newbie traders hitting the chart with no knowledge on how to trade as well, it makes trying to instigate certain movements in the market easy for whales.