There's certainly a good reason why these ten companies might dominate their markets: They're very, very good at what they do.
Having worked extensively with both Procter & Gamble and Frito-Lay (PepsiCo), I can attest to their commitment to product quality/performance and consumer value. They have justifiably earned their position in the marketplace by doing a better job than their competitors.
“...Procter & Gamble...earned their position in the marketplace by doing a better job than their competitors.”
And making a deal with the Devil and putting Satanic signs on all of your products doesn’t hurt either! /s