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Epicurus is an aesthetic hedonist- much more pallatable than the more materialistic strain, but nonetheless, his philosophy is only accessible to a leisure class supported by a slave underclass.
The silk road was generating huge amounts of income for centuries before the arrival of Islam, and yet the "barbarians" ruling over it never achieved the level of advancement in architecture, mathematics, astronomy, poetry, or a number of other disciplines that were achieved in the Islamic golden age. Also, remember that the civilized/barbarian dialectic used by the Greeks has still been used in our lifetimes in Bush's "with us or against us" rhetoric.
The math behind neo-liberal economic theory that points to the wealth generating effects of free trade is sound. The reason that it attracts the ire of the left is because of a problem that is more difficult to calculate- the wealth generated by this free trade is unevenly distributed and intensifies class divides. The decline in influence of the Sassanid and Byzantine empires and the rise of Islam opened up a huge area where goods were able to move more freely due to improved security and decreased taxation- Islamic law taxes wealth, rather than income or trade. Zakat, one of the pillars of Islam, acts as a wealth tax, a sort of negative interest rate and a redistributive mechanism as well as an investment incentive, which increases productivity and helps allay the social tensions that the militaristic structures and intensive taxing of other empires usually quell with sheer force or spectacles.
The military is provided for by voluntary donations by citizens due to the spiritual rewards that are associated with participating in the military ventures of the Islamic state, which relieves a huge amount of the tension that plagued Rome and still affects those following the Roman tradition, like the US and Western Europe. The failures of the various Caliphates can be attributed more to their failure to adhere to the shari'a than the principle itself. In the same vein, the negative image of Islam in Western media, while serving specific economic interests- in particular the interest hungry financiers of the global economic order- is bolstered by the actions of individuals who stray from clear edicts in shari'a- such as the prohibition on dying by one's own hand- and are picked up as poster children for the Christian PR campaign that has not rested since the crusades... these individuals have been supported both ideologically and technically by both the KGB and CIA (via Saudis by CIA, and in Soviet incitement of aggression toward Israel by KGB see http://en.wikipedia.org/wiki/Active_measures), and have proved useful not only as pawns in geopolitical maneuvering, but also to demonize the one ideology that has the potential to provide a credible alternative to both communism and capitalism-an ideology whose spread would erode the dynamic tension that sustains both the bipolar world of the cold war and the two party system, and would render the skill set of the current elite obsolete. The elite are fighting for their survival using any means possible, and our minds are their battlefields, and the media the weapons.
Anyway, it was not my intention to thread-jack- apologies for the rambling...