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Revaluation is a change in a price of a good or product, or especially of a currency, in which case it is specifically an official rise of the value of the currency in relation to a foreign currency in a fixed exchange rate system.
Between the 9th and 14th centuries, the Muslim world developed many advanced economic concepts, techniques and usages. These ranged from areas of production, investment, finance, economic development, taxation, property use such as Hawala: an early informal value transfer system, Islamic trusts, known as waqf, systems of contract relied upon by merchants, a widely circulated common currency ...