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Nobel Prize winner of economics Joseph Stiglitz wrote in May 2011 : " Much of today ’s inequality is due to manipulation of the financial system , enabled by changes in the rules that have been bought and paid for by the financial industry itself - one of its best investments ever .
 Joseph Stiglitz
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Joseph Stiglitz