Amit Roy | | Published 17.04.21, 12:33 AM Even I can understand a simply written new book on economics which explains why gross domestic product is no longer the best way to measure how well a country is doing since it does not take into account other relevant factors, such as the environmental damage caused by a dam, for instance, or unpaid house work by women. But GDP: The World’s Most Powerful Formula and Why It Must Now Change by Ehsan Masood, a science journalist and senior editor at the journal, Nature, in London, also tells of the close friendship between Amartya Sen and the late Pakistani economist, Mahbub ul Haq. They first met as undergraduates at Cambridge in 1953 and collaborated in America in 1989 on the possible alternative concept of a “Human Development Index”.