Economics sometimes has surprising applications. One example is the Alchian-Allen theorem, an observation that came from a footnote in an economics textbook in the 1960s about how quality demand is affected by transport costs.
You may think this has nothing to do with you, but it does, because it explains why you consume so much internet animal hilarity and so little Shakespearean seriousness. It comes down to economics. Seriously. Smart people make these choices and it is fascinating to understand why.
For example, the best predictors of high intelligence include “Thunderstorms,” “The Colbert Report,” “Science,” and “Curly Fries,” whereas low intelligence was indicated by “Sephora,” “I Love Being A Mom,” “Harley Davidson,” and “Lady Antebellum.”
tl;dr (Selected & Predicted Facebook Likes by trait, PDF)