These arguments seem to suggest that there are many causes of illness which are not within the individual's control. As individuals we are concerned with maximizing our own health. However, these issues are also important for society as a whole. Apart from moral reasons for maximizing the health of the nation, provision of health services places a considerable financial burden on taxpayers. In Britain, around 7 per cent of the Gross Domestic Product (an indicator of the nation's income) is spent on health care services, whilst working time lost through illness places pressure on business and other organizations.