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Since then , generalizations of expected utility theory have proliferated , but the probably most frequently used model is nowadays cumulative prospect theory , a rank-dependent development of prospect theory , introduced in 1992 by Daniel Kahneman and Amos Tversky .
 Daniel Kahneman, Amos Tversky
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:
 Daniel Kahneman, Amos Tversky