Digital networks also contribute to asymmetry. A few years ago, it was often assumed that the Internet would become a global point-to-point network without a center. In fact, it has evolved into a much more hierarchical hub-and-spoke system, largely for technical reasons: the hub-and-spoke structure is simply more efficient. But as the political scientists Henry Farrell and Abraham L. Newman pointed out in a fascinating recent paper, a network structure provides considerable leverage to whoever controls its nodes. The same hub-and-spoke structure can be found in many fields. Finance is perhaps the clearest case. The global financial crisis revealed the centrality of Wall Street: defaults in a remote corner of the US credit market could contaminate the entire European banking system. It also highlighted the international banks’ addiction to the dollar, and the degree to which they had grown dependent on access to dollar liquidity. The swap lines extended by the Federal Reserve to selected partner central banks to help them cope with the corresponding demand for dollars were a vivid illustration of the hierarchical nature of the international monetary system.
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