Philosopher and British Economist, born in Scotland, disciple of J. Bentham and friend of D. Ricardo, collaborated in the Encyclopedia Britannica with voices like Government, jurisprudence, freedom of the press, etc. His main philosophical work, analysis of the phenomena of the human mind, proposes the formation of ideas by Association of synchronous or successive sensations. He called chemical its associations to express the result of the associations is anything other than simple elements that constitute it. This partnership has great importance both in the ethical field and in the political, since the Association of elements such as pleasure and pain (basis of the ethical and social engine of the individual), leads to selfless movements, with an autonomous value, capable of pushing the individual to sacrifice his own selfish interests for the public good. Other works are: elements of economy and a fragment on Mackintosh.