An interlocking directorate of 147 companies controls 40% of global wealth

http://boingboing.net/2011/10/22/densely-linked-cluster-of-147-companies-control-40-of-worlds-total-wealth.html

http://www.newscientist.com/article/mg21228354.500-revealed--the-capitalist-network-that-runs-the-world.html

http://arxiv.org/PS_cache/arxiv/pdf/1107/1107.5728v2.pdf

So these are not operating as independent economic entities. Because their strongest ties are to each other and to the ruling class as a whole, they are insulated from outside thought. Because they are too big to fail, they are insulated from economic signals, including price signals.