The proven success of job specialization lies in the fact that: it leads to groupthink. it avoids the pitfalls of division of labor, where workers become removed from thinking conceptually about the business. it is a detractor to others who are thinking about entering your industry because it successfully creates barriers to entry. it adds efficiency to the business's operation by identifying tasks that some do better than others.

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for many centuries there were important factors which the economies of the muslim empires developed increasingly. they applied economic procedures in production, investment, finance, taxation and property. they used to tax certain goods (for example: harvest), they charged interest on money lent, they signed contracts with merchants; they relied on a common currency, and they used checks as well as promissory notes. with the money collected by means of taxation, the government provided the needy with an income. in addition, trading networks covered huge distances, so far regions started to have contact and exchange goods. this trade network covered areas of asia, africa and europe.