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The world ' s most powerful fine art auction houses , Sotheby ' s and Christie ' s , have agreed to pay 40 million dollars to settle an international price - fixing scam , Sotheby ' s said .
 The world ' s most powerful fine art auction houses, Sotheby ' s, Christie ' s, Sotheby ' s, The world
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 The world ' s most powerful fine art auction houses, Sotheby ' s, Christie ' s, Sotheby ' s, The world