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Another well-known example was documented by Ziv Carmon and Dan Ariely , who found that willingness to accept for tickets to a major basketball game was more than 10 times larger than the willingness to pay .
 Ziv Carmon, Dan Ariely
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Ziv Carmon, Dan Ariely