發送短信 : A segmented trend model to assess fiscal sustainability: The US experience 1929-2009

 _____     __   __   ______     ______   _    _   
|  __ \\   \ \\/ // |      \\  /_   _// | || | || 
| |  \ ||   \ ` //  |  --  //   -| ||-  | || | || 
| |__/ ||    | ||   |  --  \\   _| ||_  | \\_/ || 
|_____//     |_||   |______//  /_____//  \____//  
 -----`      `-`'   `------`   `-----`    `---`