Answer: Overconfidence
Explanation:
Becoming an Investment advisor is no easy feat. In most cases one would have to go through rigorous training in college after which they will probably have to get additional certification which may require more training.
All this is done to ensure that the client's money is as safe as possible in the hands of the investment advisor while they attempt to grow it. To think that after reading just 2 books on investing, one can become so good that they can manage their own investment is simply overconfidence.
Even if they were blessed with an IQ higher than Einstein, 2 books is not enough to get the requisite knowledge required. If being an investment advisor was so easy, more people would be allowed to do it.