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  ______   _    _     ____      _____     _____   
 /_____// | || | ||  |  _ \\   |  ___||  / ____|| 
 `____ `  | || | ||  | |_| ||  | ||__   / //---`' 
 /___//   | \\_/ ||  | .  //   | ||__   \ \\___   
 `__ `     \____//   |_|\_\\   |_____||  \_____|| 
 /_//       `---`    `-` --`   `-----`    `----`  
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Text this: The intangible costs of haze in Singapore and Malaysia : a willingness to pay model