1. Measured by income per person (GNI - Gross National Income per capita)
1.1 developed countries: country or economic system with income per person a year. In 2004, since 10 066 dollar up
2. Factors on human resources - the nutrition,Health, life expectancy, education, and การอ่านออกเขียนได้
3. Economic factors - consider the quality of agricultural products and the industry,. Exports of goods and services,. The rate of growth of the population, living standard
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