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|      \\   / _ \\   /_____//  |  ___|| | |  | || 
|  --  //  / //\ \\  `____ `   | ||__   | |/\| || 
|  --  \\ |  ___  || /___//    | ||__   |  /\  || 
|______// |_||  |_|| `__ `     |_____|| |_// \_|| 
`------`  `-`   `-`  /_//      `-----`  `-`   `-` 
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發送短信 : Do It Today or Do It Tomorrow: Empirical Non-exponential Discounting Explained by Symmetry Ideas