Qatar's economy is based on the export of petroleum and natural gas, and it has the world's third-largest natural gas and oil reserves. It has an unemployment rate of 0.1 percent as of 2014. Qatar has no income tax. The country has 1.8 million people as of 2014, and much of the population consists of non-Arab expatriates. Its currency is the Riyal.
In terms of total GDP, the wealthiest country is China. As of October 2014, the International Monetary Fund estimated China's 2014 GDP as $17.632 trillion.Learn more about Economics