mgb_phys said:
Who is likely to be 'smarter'? The candidate that decided to do theoretical physics/maths PhD and got accepted in top rank university or somebody who decided to do an accountancy course?
Also some of this has to do more with "interest" than "smartness". You can be reasonably sure that a mathematics or physics Ph.D. doesn't totally hate math, and can do math intensive things for 12 hours a day for years at a time without going totally crazy. You *don't* know that about your average MBA or finance major.
One side effect of this is that if your main goal is to make money, then you are much, much better off with an MBA than a physics Ph.D. Your typical investment bank has about 30,000 employees of which about only a few hundred have technical Ph.D.'s, so the vast majority of jobs in finance do not require a Ph.D.
On the other hand, these numbers are interesting when you realize that the US produces about 100,000 MBA's a year, and only about 1000 physics Ph.D.'s. One interesting statistic is that the Harvard MBA program puts out about 900 or so MBA's a year, which is close to the number of Ph.D.'s from all schools.
If somebody is smart enough to do a maths PhD how long would it take them to learn the difference between a futures and options contract?
Or figure out the difference between a futures contract and a forward contract, which is more subtle and interesting. Futures contracts are traded on a exchange, and forward contracts are traded directly between counterparties. That part you can google. Now how this fact affects the pricing model is something that you can't google for, and to find out the answer to that, you have to start e-mail people, asking around, and thinking about the topic.
A lot of people are extremely uncomfortable if you put the in a situation where no one tells you what you have to do and in which no one has written a book with the "right answer" and you get into serious trouble if you do the "wrong thing" even though no has told you what the wrong thing is in large part because no one knows what that wrong thing is. Look at the number of people that get upset if they are graded on material that the prof didn't cover in the lecture.
But Ph.D.'s tend to get hired because you know that they won't freeze in that situation.