Quote from risktaker:
Sorry, but that chart serves a very limited purpose. I'ts very difficult to store meaningful amounts of oil. Therefore, demand almost always equals supply. If supply goes down, how are you going to plot "demand" if real demand has to closely match supply? You can't stock oil like other commodities.
Prices, as a result can be distorted by over/under production of a negligible amount of crude & makes it susceptible to market manipulation by speculators & others with big pockets.
Take what you want from the chart. I believe that speculation ran up oil prices in '08. However, it is apparent during that time period that demand also significantly overshot supply. Both conditions - excess speculation and a drop in supply could have co-existed.