This paper presents the concept of altruity and illustrates its philosophical and practical importance in the fight against poverty. Altruity –a highly specific form of rational altruism– is the duty that comes with freedom. The individual duty of altruity is the necessary counterpart of the right to individual freedoms. It is, by its very nature, distinct from (though complementary to) generosity, and devoid of any expectation of reciprocity (while not excluding it). The idea of altruity is the cornerstone of a theory of individual responsibility, and of a theory of justice, which provide a conceptual framework for the struggle against poverty. And because it is only meaningful if implemented with a pre-defined method, it also provides a f...