= {0, . . . ,20}. The second option, option
b, is
such that the dictator keeps 18 points for herself and gives two points to the receiver: the
distribution (18,2). In decision 1, the dictator thus chooses between the distribution (0,0)
(zero for herself and zero for the receiver) and the distribution (18,2) (18 for herself and
two for the receiver); in decision 2, the choice is between (1,1
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