Wow... Phil, did you read that somewhere? I've heard similar stories with basically the same point, which I think is to learn to step slightly outside of your comfort zone. Once you're comfortable again, you repeat the process.
I think in this case, the 100 dollar bill is slightly outside the comfort zone of the beggar, and he's unwilling to take the chance on something he's unsure about.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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