Why Big Wealth Flows Straight to the Top (BAC, BRK-B, GS, WFC)

Why Big Wealth Flows Straight to the Top (BAC, BRK-B, GS, WFC): My personal view is I don't think there is a single cause. I think it's a number of things going on. One is definitely globalization. Another probably more important is the technology revolution. A third, I do think that there are some political and cultural factors going on?