"Opacity"is the lack of clear, accurate, formal, easily discernible, and widely accepted practices in the world's capital markets. This report on the Opacity Index provides estimates of the adverse effects of opacity on the cost and availability of capital in 35 countries. It offers a composite score for each country, based on opacity data in five different areas that affect capital markets: a) corruption, b) legal system, c) government macroeconomic and fiscal policies, d) accounting standards and practices (including corporate governance and information release), and e) regulatory regime.