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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