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Watching a stock drop after hours , open lower , and close even lower than that makes me wonder just who ' s selling : a runup usually builds on a gradual crescendo of greater - fool theory - - everyone thinks they can always sell to someone dumber - - and ends when the greatest fool yet gets sick of the whole thing and bails .
 me, who, everyone, they, someone dumber, the greatest fool yet
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:
 me, who, everyone, they, someone dumber, the greatest fool yet