This book covers two years of research activities associated with Project LINK, which is based on a model of the world economy, covering 79 countries or regional groupings of countries. Papers dealing with interesting thematic issues were carefully selected and expanded into full articles. The subjects studied by various LINK participants for reporting at annual meetings include exchange rate systems, international investment, environmental protection, international economic institutions, LINK system improvements, and international economic policy. As always, there are contributions dealing with methodological advances for world modeling.