Last fall, Foreign Policy published what it called a global cities index, a list of 65 world cities ranked according to a variety of economic, cultural, and social indicators. Compiled by the consulting firm A. T. Kearney and the Chicago Council on Global Affairs, the index measures business activity, the size of capital markets, and the flow of goods through airports and ports. It also takes into account cultural and information resources such as the number of performance venues, the extent of broadband access, international coverage in the local...