When I was growing up, the unseen public enemy #1 was Carlysle group. Then it was Bain & Co. - Mainly because of Mitt Romney.

Yes, there are some very deep and influential forces in business. You could also write a piece about how a handful of law firms influence the majority of the legal system, how a handful of VC's influence the majority of tech that is taking over our lives, or a few Ivy League schools influence the majority of business, politics, an everything else.

Everything is a conspiracy if you want it to be enough.

There is about $420 Trillion in global assets. The fact the largest asset management company in the world, has only $10 Trillion under management, or about 2.3% of the world's assets, makes me think the financial world is rather decentralized.