The Science article is called Economic Networks: The New Challenges
by Frank Schweitzer et al. in Science, July 24, 2009. Here's the abstract:
"The current economic crisis illustrates a critical need for new and fundamental understanding of the structure and dynamics of economic networks. Economic systems are increasingly built on interdependencies, implemented through trans-national credit and investment networks, trade relations, or supply chains that have proven difficult to predict and control. We need, therefore, an approach that stresses the systemic complexity of economic networks and that can be used to revise and extend established paradigms in economic theory. This will facilitate the design of policies that reduce conflicts between individual interests and global efficiency, as well as reduce the risk of global failure by making economic networks more robust."
The bit that Paul picked out is a graphic that shows the flow and liquidity of trading between banks, as follows:
Node colors express different
geographical areas: European Union members (red), North America (blue),
other countries (green). The identifiers in the nodes represent major financial institutions
and the links are both directed and weighted and represent the
strongest existing relations among them.
Even with the reduced number of links
displayed in the figure, relative to the true world economy, the
network shows a high connectivity among the financial institutions that
have mutual share-holdings and closed loops involving several nodes.