Until recently, the lion’s share of the research on income and happiness focused on relatively rich individuals—the Birlas and Bill Gateses. Not much is known about the happiness of those living without access to air-conditioning, swimming pools and Harry Potter. I have spent my professional life attempting to fill this gap in scientific knowledge by researching on the "subjective well-being" of people who live a simple lifestyle. Some of these groups, such as Calcutta’s sex workers, are victims of circumstance, birth, or unfavourable economic trends. Other groups I have studied, such as the Amish, a Christian group in the US who reject the use of conveniences such as electricity and cars, choose their lifestyle. Others I have worked with, such as seal-hunters in the Arctic or tribal Kenyans, are forced to survive in their harsh environs.