Journal Article Optimal Trade Policies and Non-Economic Objectives in Models Involving Imported Materials, Inter-Industry Flows and Non-Traded Goods Get access Augustine H. H. Tan Augustine H. H. Tan University of Singapore Search for other works by this author on: Oxford Academic Google Scholar The Review of Economic Studies, Volume 38, Issue 1, January 1971, Pages 105–111, https://doi.org/10.2307/2296625 Published: 01 January 1971