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Michael Spence is an American-born economist and winner of the 2001 Nobel Memorial Prize in Economic SciencesMichael Spence may also refer to :
 Michael Spence, Spence
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Michael Spence, Spence