I heard a claim from a guy in my class during high school, which was like 6 years ago or so, saying that the three 'biggest markets' in the world are drugs, sex and weapons. It of course implied quite a bit about human nature, and the state of the world.
I am curious if there was any truth in that statement? Is it those three that have most revenue, most users, or most money circling about in, or in any other interpretable way being 'three biggest'?
That is not an overly trustworthy site, but it claims
Wildlife trade, as many of you may know, is the third largest black market after drugs and guns.
There they make an estimate on how big the 'shadow markets' are. Which is related to the topic as well as drugs, weapons and sex usually are illegal.
Region World Minimum 18.54 Maximum 27.74
The black market is assumed to be somewhere between 18% to 28% of GPD. How would that compare to legal market then?