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Economists such as John Roemer and Pat Devine have advocated for socially owned enterprises as a major component for hypothetical socialist economies , defining social ownership as ownership of an enterprise by those affected by the use of the assets involved .
 John Roemer, Pat Devine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 John Roemer, Pat Devine