At a primary level, the taxing rights that each country asserts depend on whether the country uses a system of taxation that is residence-based, source-based, or both. In a residence-based tax system, a country will include in its tax base all or part of the income, including income from sources outside that country, of any person (including juridical persons such as corporations) who is considered resident in that jurisdiction. In a source-based tax system, a country will include in its tax base income arising within its tax jurisdiction, irrespective of the residence of the taxpayer. As applied to MNEs, these two bases, often used in conjunction, generally treat each enterprise within the MNE group as a separate entity. OECD member countries have chosen this separate entity approach as the most reasonable means for achieving equitable results and minimising the risk of unrelieved double taxation. Thus, each individual group member is subject to tax on the income arising to it (on a residence or source basis).