The paper examines how developing countries can use existing policy space, and enlarge it, without opting out of international commitments. It argues that: (i) a meaningful context for policy space must extend beyond trade policy and include macroeconomic and exchange-rate policies that will achieve developmental goals more effectively; (ii) policy space depends not only on international rules but also on the impact of international market conditions and policy decisions taken in other countries on the effectiveness of national policy instruments; and (iii) international integration affects policy space through several factors that pull in opposite directions; whether it increases or reduces policy space differs by country and type of integration.