發送短信 : PORTFOLIO SELECTION WITH TRANSACTION COSTS IN A REGIME SWITCHING MODEL

  _____      ___                 ___     ______   
 |__  //    / _ \\    ____      / _ \\  |      \\ 
   / //    | / \ ||  |    \\   | / \ || |  --  // 
  / //__   | \_/ ||  | [] ||   | \_/ || |  --  \\ 
 /_____||   \___//   |  __//    \___//  |______// 
 `-----`    `---`    |_|`-`     `---`   `------`  
                     `-`