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Named after Swedish economist Knut Wicksell ( 1851-1926 ) , Wicksell 's theory of capital examines factor prices as derived from the value of the marginal product .
 Swedish, Knut Wicksell, Wicksell
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Swedish, Knut Wicksell, Wicksell