This article uses a multi sector, multicounty, computable general equilibrium model to examineChile's strategy of 'additive regionalism'negotiating bilateral free trade agreements with all of itssignificant trading partners. Taking Chile regionalarrangements bilaterally, only its agreements with Northernpartners provide sufficient market access to overcome tradediversion costs. Due to preferential market access, however,additive regionalism is likely to provide Chile with gainsthat are many multiples of the static welfare gains fromunilateral free trade. At least one partner country losesfrom each of the regional agreements considered, andexcluded countries as a group always lose. Gains to theworld from global free trade are estimated to be vastlylarger than gains from any of the regional arrangements.