I use the metaphor from agriculture a lot... a MONOculture crop may be more "efficient" in terms of usual yield but it is also prone to huge crashes in the ecosystem and more easily made "extinct". A "world-wide currency" or "Euro-wide" currency may be convenient but.... a disease in one part can potentially stress the rest of the system.
Centralization and trans-national corporate globalization really only makes sense if you're one of the very few who are leeching the profits off of it.
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