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Gas-rich Qatar is the world's richest country with GDP per capita of $102,800, according to the CIA World Factbook.

Qatar relies on its natural gas reserves — which are the world's third largest — for revenue. It has invested heavily in infrastructure to liquefy and export the commodity. Businesses involved in oil and gas operations face a 35 percent tax rate. The country levies no taxes on personal incomes, dividends, royalties, profits, capital gains and property. Qatar nationals, however, have to pay 5 percent of their income for social security benefits, while employers contribute 10 percent for the fund.

Last year, reports surfaced that the government was considering a value-added tax in an attempt to broaden its revenue base and reduce its non-hydrocarbon deficit, which was equivalent to 17 percent of the country's GDP in 2011. Other indirect taxes include a 5 percent charge on imported goods.

Pictured: Doha corniche, Qatar.

Photo: Celia Peterson | Getty Images