The present day sense of health being a public concern for the state began in the Middle Ages. A few state interventions include maintaining clean towns, enforcing quarantines during epidemics and supervising sewer systems. Private corporations also played a role in public health. The funding for research and the institutions for them to work were funded by governments and private firms. Epidemics were the cause of most government interventions. The early goal of public health was reactionary whereas the modern goal is to prevent disease before it becomes a problem. Despite the overall improvement of world health, there still has not been any decrease in the health gap between the affluent and the impoverished. Today, society is more likely to blame health issues on the individual rather than society as a whole. This was the prevailing view in the late 20th century. In the 1980s the Black Report, published in the United Kingdom, went against this view and argued that the true root of the problem was material deprivation. This report proposed a comprehensive anti-poverty strategy to address these issues. Since this did not parallel the views of the Conservative government, it did not go into action immediately. The Conservative government was criticized by the Labour Party for not implementing the suggestions that the Black Report listed. This criticism gave the Black Report the exposure it needed and its arguments were considered a valid explanation for health inequality. There is also a debate over whether poverty causes ill-health or if ill-health causes poverty. Arguments by the National Health Service gave considerable emphasis to poverty and lack of access to health care. It has also been found that heredity has more of a bearing on health than social environment, but research has also proved that there is indeed a positive correlation between socioeconomic inequalities and illness.