rigged market is one argument. another is that price discovery is still in process, it's still a relatively new commodity, there's as much reason for it to go u

rigged market is one argument. another is that price discovery is still in process, it's still a relatively new commodity, there's as much reason for it to go up as there is to go down. bull run of 2017 was no different from one in 2013 and 2010 before that - there's no strong argument to say 2017 was the last one.