Abstract
Several alternative paths have been proposed for extending the current system of Western Hemisphere sub-regional trade agreements into a more comprehensive scheme of hemispheric integration. The scenarios of NAFTA accession, hub-and-spoke arrangements and trade agreement merging, are analyzed, including incentives for and barriers to each path. Patterns of recent negotiation activity, as well as the strong requirements for NAFTA accession, imply that trade agreement merging is currently the most probable scenario.

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