As a role, design builds intrinsic value to objects on a mass level. Visually, we utilize proportion, volume, and composition and the such. Tactically, we add texture, temperature and density. Emotionally, we create narratives, and experiences as intangible objects. I think as you build on these 5 senses, realize that design has, as wells as Art, been building from these foundations since we created the definitions of Art and Design. But I think the latter places a very distinct value on those experiences with monetary/currency value as the derivative of those experiences.
Structure your thesis accordingly and communicate your research simply enough for the masses to understand. See Stephen Hawkings, “A brief History of Time” as a good structure for presentation of this topic. Good luck.