Secondly, your view of free markets is naive. Lack of transparency and the problem of monopolies are only a few of the many problems that completely free markets suffer from. We have an FTC, because markets need to be regulated. Leaving them completely free leads to morally unacceptable results.
Are you really claiming we dont need "coercion or force" from regulators like the SEC or FTC?
It is naive to think any one human agents or regulatory agency is able to prevent those "complex unregulated derivatives" or not be corrupted by unethical firms/special interests/etc.
The free market system already have a "fail-safe" or "regulatory" function through the bankruptcy of entrepreneurs and rewarding prudent entrepreneurs with the leftover possessions of the bankrupt one. Failure is at the heart of the free market enterprise system. It is a feature, not a bug.
It is those who wishes to prevent these failures at all and any costs that keep our society stagnated or hurling down to its destruction as they keep funding economic activities that is out of reality with human needs and desire.
You can hire someone to murder someone else. Nothing wrong with that transaction in a free market. Similarly, you can be a credit card processor for child pornography - you take your cut, but since you don't do the deed, it's not your problem.
Do you see the problem?
(Hint: morality isn't emerging here. It comes from somewhere else.)
And I have no idea why you mentioned some "other economic system". I didn't. Why? Because I wasn't contrasting economic systems. I was contrasting moral systems.