As of 2013[update], the combined GDP (nominal) of 51* Muslim majority countries was US$ 12.97 trillion.
[2] Those 57* OIC countries have a combined GDP (at Purchasing power parity; PPP) of US$ 23.948 trillion.
The largest economic country based on total PPP and Nominal GDP is Indonesia.
The richest country on the basis of GDP per capita at PPP is Qatar, with incomes exceeding $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.