This emotional labor requires poorly paid service employees, from cashiers to servers to food prep, to perform happiness and friendliness as part of the job requirements.

FORBES: Super Bowl Ads Serve Up Sexism

When it comes to emotional labor, mindfulness promotes accepting and recognizing negative emotions instead of repressing them, which puts less strain on our emotional resources and preserves vitality.

FORBES: Tired, Stressed Out, Need A break? Recognize It But Don't React

So-called "emotional labor" -- tasks like writing holiday cards, scheduling doctor appointments and planning family gatherings -- is too often left to wives, says University of Michigan sociologist Pamela Smock.

CNN: Housework and sex: What's the connection?

This so-called emotional labor has been linked to burnout.

FORBES: Tired, Stressed Out, Need A break? Recognize It But Don't React

Delivered as an intimate and emotional discussion, Mr. Daisey helped put a new spotlight on labor conditions in factories that make Apple's gadgets.

WSJ: 'This American Life' Retracts Apple-China Story