First of all I want to make sure it's clear I look at murder with disgust and find it appalling. This is not about murder as an ethical issue (a pretty consensual subject) but as en economical issue.
Some murders are due to uncontrolled emotions, passion etc. There is no pecuniary incentive here. Other murders, however, are motivated by financial concerns, from the thug in the street to the guy pushing his uncle down the stairs. But how frequent are corporate murders? What is the benefit for a company to murder the CEO of another competing company to get a market? There are various possibilities:
a) it happens all the time and no one knows about it, the accident rate is just higher for CEOs
b) people are ethical, very few people actually are morally capable of committing murder
c) police and justice are efficient, the prospect of getting caught stops people from doing it, killing a CEO may help your company but it's not profitable enough to take the risk
d) the people who would commit murder don't figure the opportunity
(a) doesn't seem likely. I don't have any data to support this, it is just a gut feeling... somehow if it were true, he'd be known.
(b) is what I want to believe, what I hope is the true reason. Yet some people do commit murder, so maybe it's a combination of b and d.
(c) is what I'll discuss now
More than ever, demand for goods is very elastic and you compete with almost every business... killing a competitor may not be very useful to you. It is also possible that CEO are disposables and don't affect company revenues, or that when they do they are extremely well guarded. However, whenever there are CEO changes, the stock market reacts. Theoretically, a CEO murderer could make very profitable trades on the market, even on smaller companies whose boss is not extremely protected. The same is true for terrorism, which can be extremely cheap. Why don't we see apolitical terrorists targeting publicly traded companies for stock speculation? A few years ago in France, a group tried to get a few millions from the government by threatening to use terror... this is extremely risky, there is a money trail, they have to make their existence known etc... and the money is pocket change to what they could have been quietly making.
It seems that crime does pay, unless smartness correlates with morality, unless I am widely mistaken about the extent of crime in society, I think there is a strange puzzle here.