Smile. Dictionary says

1. A facial expression characterized by an upward curving of the corners of the mouth and indicating pleasure, amusement, or derision.
2. A pleasant or favorable disposition or aspect.
   

Huh. What a hypocritical world. We are sending 4 million smiles to the thick wallets. And yet we are ranked 30 out of 35 countries in terms of courtesy. How sincere are we to actually give that smile. What a complicated world that I'm living in.