Purchasing power
The economy of the Organisation of Islamic Cooperation (OIC) combines the economies of 57 member states. 53 are predominantly Muslim states. Those 57 OIC countries have a combined GDP (at Purchasing power parity; PPP) of US$22.149 trillion. The richest country on the basis of GDP per capita at PPP is United Arab Emirates. On basis of per capita GDP, Qatar is richest country with incomes exceeding US$133,357 per capita. According to a report by Salam Standard, the GDP impact of the world’s Muslim tourism sector exceeded $138 billion in 2015, generating 4.3 million jobs and contributing more than $18 billion in tax revenue.