Considering that “Person to Person” is the series finale of Mad Men, it’s best to start with its final images: the famous “I’d Like to Buy the World a Coke” commercial from 1971 that married we-are-the-world humanism with an absurd and insidious kind of capitalism. Writer-director Matthew Weiner cuts to the ad just as Don (Jon Hamm) begins to smile, settling into his first meditation session at a new-age pavilion in Northern California. Is he imagining the ad? There’s not much to suggest Don is going to revert back to his life as a calculating ad man, especially after the way he reacts to Peggy (Elisabeth Moss) saying McCann would take him back. More conceivable is the idea that even this seemingly positive-minded form of self-exploration will eventually be co-opted and dumbed down to sell carbonated sugar water to the masses. And as much as a way of processing existence, such as meditation, can be packaged and sold, so can people begin selling themselves as a product or a way of life, something that someone must choose over something else to prove their worth.