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Integration theory is as relevant today as it was when JCMS was founded. One set of reasons is empirical: virtually every region of the globe is experimenting with new arrangements or reforming existing regimes. Economic globalization is, in large measure, channelled through and registered on regions (Kim and Shin, 2002). Regional integration also raises an important theoretical challenge: how do we explain variation in the design of regional regimes and the outcomes that they have produced? Some integration schemes fail to attain most or any of their objectives, while others are highly successful. In this section, we reflect on these issues by reviewing the main approaches to CRI.
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