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             ___     __   _    _    _      _____  
  ____      / _ \\  | || | || | || | ||   / ___// 
 |    \\   / //\ \\ | '--' || | || | ||   \___ \\ 
 | [] ||  |  ___  ||| .--. || | \\_/ ||   /    // 
 |  __//  |_||  |_|||_|| |_||  \____//   /____//  
 |_|`-`   `-`   `-` `-`  `-`    `---`   `-----`   
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發送短信 : Market size, comparative advantage and the natural rate of unemployment