The approach was fun, but has fallen out of favourListen to this story. Enjoy more audio and podcasts on iOS or Android.Your browser does not support the <audio> element.“Economics is a study of mankind in the ordinary business of life.” So starts Alfred Marshall’s “Principles of Economics”, a 19th-century textbook that helped create the common language economists still use today. Marshall’s contention that economics studies the “ordinary” was not a dig, but a statement of intent. The discipline...