"...If migrants are as productive as Thai workers in each sector, their total contribution to output should be in the order of $11 billion or about 6.2 per cent of Thailand?s GDP. If they were less productive (say only 75% of Thai worker output) their contribution would still be in the order of $8 billion or 5 per cent of GDP. Migrants contribute anywhere from 7 to 10 per cent of value added in industry, and 4 to 5 per cent of value added in agriculture...."