A single global response would produce a uniform approach. A decentralized response fosters experimentation.

The bottom line is that the swine flu crisis is two emergent problems piled on top of one another. At bottom, there is the dynamic network of the outbreak. It is fueled by complex feedback loops consisting of the virus itself, human mobility to spread it and environmental factors to make it potent. On top, there is the psychology of fear caused by the disease. It emerges from rumors, news reports, Tweets and expert warnings.

The correct response to these dynamic, decentralized, emergent problems is to create dynamic, decentralized, emergent authorities: chains of local officials, state agencies, national governments and international bodies that are as flexible as the problem itself.

Swine flu isn’t only a health emergency. It’s a test for how we’re going to organize the 21st century. Subsidiarity works best.