The last few years have seen nostalgia come to dominant popular culture. From the "Star Wars" film sequels, to the video game Pokémon Go, and the classic sitcom "Friends" becoming one of the most streamed shows on Netflix, a person would be forgiven for forgetting it isn't the '90s. The Agenda explores the power of nostalgia, why it's more popular than ever, and how companies are harnessing that power.