It's likely you've either worked in a customer facing role or you've been the customer; we imagine for many of you it's both. So then, when service is given with a smile, who benefits most, the employee or the customer? Dan and Akin squeeze some interesting findings that question who's in need of training.  - Research Paper: 'Why Does Service with a Smile Make Employees Happy? A Social Interaction Model' by Eugene Kim and David Yoon