it's simply the division of labor as modified by imbalances caused by violations of property rights (funny money and bad laws). People will always buy the best product at the lowest cost, that includes labor. When you skew the pricing, some things are artificially low and some artificially high. Global trade under a global fiat currency will have massively distorted markets and the only way to keep it together is more and more intervention and violence as the system becomes more and more unstable and unworkable. Governments who publicly decide to leave this "order" end up occupied or their leaders are dragged through the streets by "rebels".
"Endless money forms the sinews of war." - Cicero, www.freedomshift.blogspot.com