Praag, Bernard M.S. Van The relativity of the welfare concept / Bernard M.S. Van Praag - Helsinki : World Institute for Development Economics Research (WIDER) , 1989 - 43p. : ill. ; 18 cm. - WIDER Working Papers No. 69 . Includes bibliographical references Subjects--Topical Terms: welfare relativity Gov. Doc. Class. No.: UN U WIDER WP-69