We are no longer writing the rules of interaction among separate national economies. We are writing the constitution of a single global economy.Abstract: To the liberal economist,`globalisation' denotes the virtuous circle of expanded trade, investment and economic growth around the globe. In the political world, globalisation' is the vaguely understood and yet powerful undercurrents of irrevocable economic changes which have generated social tensions and environmental damage, loss of domestic competitiveness and national sovereignty. Throughout the social sciences, the usage of the term`globalisation' is largely inconsistent and inconclusiveÐbut its imprecision is matched only by its popularity. This article suggests that globalisation should be understood as a reconstruction process of the market as well as the polity. It is essentially a form of global market integration which can be observed from dierent vantage points, including governance. The premise of the article is that global market integration is surprisingly fragile and requires an adequate institutional foundation in order to move forward. Globalisation and governance are mutually constitutive phenomena. The polity governing the global market integration process cannot be separated in any meaningful sense from the changes in the market itself. This article concerns the institutional requirements of globalisation. While globalisation has produced institutional changes, it has not necessarily produced the most eective or legitimate ones. Exactly what polity construction should underpin globalisation? Should globalisation be left ungoverned? Should existing institutions be improved? Does it require the establishment of supranational sites and the re-construction of hierarchical legal order at global level?