發送短信 : Choice of flexible functional form in total factor productivity measurement.

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