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In page Colombo:

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The Colombo Metropolitan area has a GDP (PPP) of $122 billion or 40% of the GDP, making it the most important aspect of the Sri Lankan economy.[citation needed]The per capita income of the Colombo Metro area stood at US$8623 and purchasing power per capita of $25,117, making it one of the most prosperous regions in South Asia.[2] The Colombo Metropolitan (CM) area is the most important industrial, commercial and administrative centre in Sri Lanka. A major share of the country's export-oriented manufacturing takes place in the CM area, which is the engine of growth for Sri Lanka.