Denote the Amount Sent by the Sender in the Trust

Essay

Denote the amount sent by the Sender in the trust game as "S", the amount sent back by the Receiver in the trust game as "R", the amount sent by the Allocator in the triple dictator game by "X" and the amount sent by the Allocator in the dictator game as "Y". How do Ashraf, Bohnet and Piankov use the dictator game, the triple dictator game and the trust game to distinguish between (a) trust and altruism and (b) reciprocity and altruism?