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One important example of this is that if developing countries produce mainly primary products and low value manufactured goods with a low income elasticity of demand , while developed countries specialise in high income elasticity manufactured goods the developing countries will grow at a relatively slower rate ( Davidson , 1991 ) .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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