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Trade also attracts "Protectors" as was the case with Timur, who profited not from trade itself but by gatekeeping it. I claim he was a barbarian and not worthy to include him and his empire in any islamic golden age simply for the fact that he had the honnors of massacring 5% of worlds population. And yet still not a sharia promoter either.
I still fail to see how sharia, or any other religious law for that matter, is objectively better that Roman Law.
And yes Law is decoupled from Religion in the west, in your arguments you are simply confusing Law with Power.
Yeah, okay Timur was kind of lame... but it can be said that he did institute and maintain many practices of Islamic law, and the caliphate of Cordoba and Berber rule in spain also has a huge legacy in the intellectual history of the west... especially considering that that is where the knowledge of astronomy and wealth came that allowed the portuguese and spanish to effectively launch their colonial expeditions, which eventually led to the rise of Europe as a world power.
I think it's quite plain to see how a negative interest rate of 2.5% is better for consistently driving economic growth and investment. Any time there is an excess of labor available, the system is inefficient. A negative interest rate is the best way to get to full employment possible, because it means that their is a constant incentive to invest and employ the labor force by building things like irrigation projects, schools, universities, factories, foundries, mines, workshops, vehicles, farms, and anything else that generates revenue and has resale value. Islamic law also prohibits the use of derivatives and abstract financial devices that ultimately generate buying power out of nothing, effectively devaluing the labor of those whose labor is denominated in fiat currency. This also limits the rampant growth of the financial sector. But why is growth in the financial sector a problem? They're productive, right? See the graph here
http://en.wikipedia.org/wiki/Financialization Islamic law effectively makes deficit spending impossible... which might explain part of why the US is so keen on making sure Islamic law is not implemented on earth.
The basis of the law is that it is from God and its implementation is for the best interest of the people who follow it. Twisting it or trying to make it favor a certain class or monarch only leads to disaster. It is so clearly codified in established source material that cannot be revised or edited- even in translation it is hard to interpret your way out of 80 lashes or the total prohibition of interest. It also results in much lower taxation, which is one of the ways that the Islamic empires were able to spread so quickly- where do you live that you wouldn't consider a change in administration in exchange for a 20-40% tax cut?
So Islamic law increases efficiency in investment, trade, and taxation, increasing the stability and legitimacy of the government. The failures of Islamic dynasties can be attributed to their lack of adherence to the law, and their success comes from the momentum established by the first generations who more faithfully applied this law. The revival happening right now is heating up as the next phase of the information wars begins, and people realize that the crusades are ongoing and it becomes increasingly clear that the "freedom" the west is fighting for is a purely economic freedom that is being concentrated into fewer and fewer hands.
I say it is an economic freedom, because the freedom of expression and social liberation that characterizes the Western European liberal tradition is only possible with an insulating buffer of vassal states where dissidents are imprisoned, tortured, and killed. As wealth becomes more concentrated, it becomes more difficult to secure the consent of the subjects of the state with bribery- like all you can eat buffets and xbox 360's, and it becomes increasingly necessary to limit public gatherings, illegally wire tap, imprison, and so on and so forth. The modern banking system traces its roots back to the Knights Templar, and the crusades continue...
So the internet is making an understanding of Islamic law possible, which, as it penetrates Islamic population is leading to a rise in what the Western intelligence agencies have instructed the media to call "extremism." This is setting the stage for a civil war across the entire middle east flaring up between recipients of western "aid" and those left out of these payments. I'm guessing eventually China and Russia will challenge U.S. hegemony in a series of proxy wars, and exhaust each other among ecological fallout (Islamic culture being well adapted to rising desertification and scarcity of water), setting the stage for yet another phase of Islamic expansion as a new caliphate expands into areas inherited from declining Russian, Chinese, European, and US influence, in the same way the East-West Byzantine-Sassanid wars laid the way for the expansion of the early Islamic empires. Anyway, sorry for the digression, but this is still with the theme of correlating historical events to present circumstances at least.
More concretely, it is difficult to generalize and say Islamic law is better than Roman law as a whole, but I would challenge that it cannot be objectively that any single aspect of Roman law is better than Islamic law.