Sorry for the confusion, I should have been more explicit

Here is a personal perspective on expertise: I tend to believe that real and observable expertise often involves physical skills, like carrying out a brain surgery, playing a violin, hitting the target from a thousand yards, fixing cars or even being the man in the Man Vs Wild To put it another way, I should be feeling safe when delegating activities or decisions to the experts in their fields of expertise. However, in the field of predicting market behaviors or trends, the long-term price of certain items to be specific, one can hardly feel safe delegating the decision makings to alleged experts. This is because the market can be so vulnerable to unpredictable inputs. For example, the crash of an exchange might crash the market itself as well, or a programming error in the trading bots can potentially push the price of a stock up through the roof, etc. The future of a market might be given, but it's not predictable, we have to wait until the day comes. Also, having a Harvard degree or being a Nobel prize winner in economics doesn't (or at least shouldn't) justify a person's ability to precisely predict the future of market behaviors.