Taxes are sometimes so fundamental to domestic systems that they are almost impossible to change, as when the tax system is part of a nation's majority religion or is linked to another value deeply rooted in local communities, such as housing or farming. There is a danger in the WTO, a Geneva-based entity, making decisions for people living in distant locations with regard to tax issues related to their local needs and wants. The Saudi Arabian tax system exemplifies the tension between religion, tax and trade, because tax has a role in the country's religion and is an essential part of its...