This book, first published in 1967, explores some of the problems formulating investment criteria for the public sector of a mixed-enterprise, underdeveloped economy. The typical essay on public investment criteria explicitly or implicitly postulates a single goal for economic analysis - maximization of weighted average of national income over time - and relegates all other objectives of public policy to a limbo of political and social objectives not amenable to systematic, rational treatment. In contrast Professor Marglin assumes a multiplicity of objectives and explores ways and means of expressing contributions to different objectives in common terms. The book also investigates the relationship of specific investment criteria to the objectives of public policy. Benefits and costs are defined separately for each objective, as are so-called secondary benefits. This book is suited for students of economics.