Chappelow (2020) “What is the Marginal Propensity to Consume?” Investopedia. https://www.investopedia.com/terms/m/marginalpropensitytoconsume.asp

Corvina, John. (2015). The Fact/Opinion Distinction. The Philosophers’ Magazine. https://www.philosophersmag.com/essays/26-the-fact-opinion-distinction

“Economics is for Everybody” from RSA Animate. Lecture by: Ha-Joon Chang