35392
Economists Gary Charness and Matthew Rabin found that in some cases , agents prefer more efficient outcomes ( i.e. outcome with larger social welfare ) than more equal outcomes and they developed a model where agents ' utility is a convex combination of own 's material payoff and the social welfare .
 Gary Charness, Matthew Rabin
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:
 Gary Charness, Matthew Rabin