It's a lack of competition that leads to market consolidation.

This is a compounding problem as companies that grow big enough can just buy then out or predatory price them out - like, say, Amazon and diapers.com.

In the end the only way to take down mono/oligopolies out is to take them out from a direction they're not expecting and that can take 100 years.

That's going to be impossible if alienating one or two companies can ruin your career in the industry. And that's aside from the fact that regulators will mostly be recruited from those couple of companies, looking for jobs with those companies when they leave, and starting consulting firms and lobbying firms that will be contracting with those couple of companies. Those companies will also have Congress's ear when regulation is discussed because they are donating so much. They are the experts.

Well, obviously, if you have a corrupt government and corrupt experts, you won't be able to achieve much... why was this downvoted ?