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Thirlwall 's law ( named after Anthony Thirlwall ) states that if long run balance of payments equilibrium on current account is a requirement , and the real exchange rate stays relatively constant , then the long run growth of a country can be approximated by the ratio of the growth of exports to the income elasticity of demand for imports ( Thirlwall , 1979 ) .
 Thirlwall, Anthony Thirlwall, Thirlwall
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Thirlwall, Anthony Thirlwall, Thirlwall