Describir: Random processes and the growth of firms :

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