These 10 Corporations Control Almost Everything You Buy: ". most products we buy are controlled by just a few companies. It's called "The Illusion of Choice. Despite a wide array of brands to choose from, it all comes back to the big guys.
Exchange Traded Funds (or ETFs) are securities that track the value of an index, commodity or a basket of assets similar to a mutual fund, but trade like stocks on stock exchanges. Here’s an infographic giving more details about ETFs Source: Investopedia