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 merit of great clearness and simplicity. An action is good which tends to promote the greatest possible happiness of the greatest possible number of those affected by it. As with an action, so, of course, with an institution or a social system. That is useful which conforms to this principle. That is harmful which conflicts with it. That is right which conforms to it, that is wrong which conflicts with it. The greatest happiness principle is the one and supreme principle of conduct. Observe that it imposes on us two considerations. One is the greatest happiness. Now happiness is defined as consisting positively in the presence of pleasure, negatively in the absence of pain. A greater pleasure is then preferable to a lesser, a pleasure unaccompanied by pain to one involving pain. Conceiving pain as a minus quantity of pleasure, we may say that the principle requires us always to take quantity and pleasure into account, and nothing else. But, secondly, the number of individuals affected is material. An act might cause pleasure to one and pain to two. Then it is wrong, unless, indeed, the pleasure were very great and the pain in each case small. We must balance the consequences, taking all individuals