The Economist explained the trilemma this way:
Dani Rodrik of Harvard University is the author of the best-known such critique. In the late 1990s he pointed out that deeper economic integration required harmonisation of laws and regulations across countries. Differences in rules on employment contracts or product-safety requirements, for instance, act as barriers to trade. Indeed, trade agreements like the Trans-Pacific Partnership focus more on “non-tariff barriers” than they do on tariff reduction. But the consequences often run counter to popular preferences: the French might find themselves barred from supporting a French-language film industry, for example.In practice, it is difficult to integrate global trade without the harmonization of standards and business practices. While that sounds fine in theory, here is an example of what happens when the rubber meets the road.
Deeper integration, Mr Rodrik reckoned, will therefore lead either to an erosion of democracy, as national leaders disregard the will of the public, or will cause the dissolution of the nation state, as authority moves to supranational bodies elected to create harmonised rules for everyone to follow. These trade-offs create a “trilemma”, in Mr Rodrik’s view: societies cannot be globally integrated, completely sovereign and democratic—they can opt for only two of the three. In the late 1990s Mr Rodrik speculated that the sovereignty of nation states would be the item societies chose to discard. Yet it now seems that economic integration may be more vulnerable.
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