1. Classical macroeconomics and the self-regulating economy Which of the following scenarios best demonstrates Say's law? Professor Mackowski teaches economics at a university and receives a monthly paycheck. Each month he spends half his paycheck and saves the rest in his piggy bank under his bed. Nandini plays the piano at a restaurant, and her income is based solely on voluntary donations. She never lets her demand for goods and services determine how long she plays the piano. Farmer Perk grows strawberries on his farm. As he grows them, he decides to buy more goods if he sells more strawberries than he expected.