There have been a number of cases in which people with no financial expertise have been pitted against financial investment experts, to see how well they fare on the stock exchange.
Here's one example from 2002 (scroll down - it's the only one I could find on basis of a quick search). Of course this, by itself, is merely anecdotal evidence that the supposed skills of stock market gurus are largely mythical.
In this example, a financial analyst, using his expertise and computer analysis, lost 46.2%, over the year while five year old Tia's portfolio, picked at random, jumped 5.8%. Even the astrologer investing on the basis of planetary movements did significantly better than the supposed financial expert.
Be interested to hear of more examples (can't find any at the moment, though I've certainly stumbled upon a few in the past) or of any evidence to the contrary. Does anyone have more information or examples?
What's really interesting about this case is that were five year old Tia actually working for a big bank, she would have been awarded several million in bonuses for her amazing abilities in 2002. Moreover, other banks would be looking to poach her, offering even more lucrative contracts and bonuses (and why shouldn't they take that risk, given a few million quid is peanuts to them if she can outperform their other traders by even 1%?)
Most importantly of all, Tia would now become what's known as a "rainmaker", attracting wealthy investors. And her increasingly large investments might now tend to outperform others. Why? Because other investors would now tend to follow her lead, thus causing her randomly generated guesses as to what stock will rise to actually come true. So Tia's predictions might tend to become more accurate. And yet she's a five year old girl with no financial skill whatsoever.
So how much of what goes on on trading floors is dumbass trader sheep following round the lucky Tias? Here's the news report:
Five-year-old girl beats experts in stock market challenge
A five-year-old girl is still beating the stock market and financial experts after randomly picking shares.
Tia Roberts took part in an experiment last year to compare different ways of predicting the stock market.
Five-year-old Tia Roberts, who's still sitting pretty a year after choosing her winning portfolio of FTSE 100 stocks (PA)
The experiment pitted Tia against financial astrologer Christeen Skinner and independent analyst Mark Goodson.
Each invested a virtual £5,000 in a fantasy portfolio during National Science Week 2001, with Christeen choosing stocks based on the movement of the planets and Mark using his expertise and computer analysis.
Tia, who picked her stocks at random by grabbing numbered notes representing each company in the FTSE 100 Index, won last year's competition as her shares performed best during National Science Week.
The test of time shows Tia is still a winner, with her portfolio the only one to gain value a year later.
Tia's portfolio is up 5.8% one year on; while Christeen's is down 6.2%; and Mark's selections have fallen by 46.2%. During the year, the FTSE 100 Index has dropped 16%. Continues at ananova.
Post Script: also just found the following opinion, for what it's worth. I wonder what studies are being referred to? I have often heard it said, but have not really looked into it before: "The reality is that luck and not skill explains outperformance by fund managers. Many studies conclusively demonstrate this fact. Neither Ms. Ralbovsky nor anyone else can help you find the next lucky quant fund manager." Go to "The Myth of The Stock Market Guru" by Dan Solin here.