Why does it have to be the mentally incapable?
If you are one of the banks who participates in Libor rate setting, then you have the advantage of access.
This has nothing to do with mental capacity and everything to do with corporate inheritance.
Indeed, to think that the only goal of work is financial profit is to miss the fact that all sorts of people have different lifestyles in mind. Many people make a living in a system which provides artists, scholars, stage actors, divers, clowns, tightrope walkers, comedians, monks and teachers with the opportunity to pursue their calling. Without the prospect of making a fortune
Such a system isn't perfect, by any means; but it isn't as awful or as monocular as you suggest, in my view.
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