While email has been considered “cost-free,” a recent JAMA Peds letter titled “Metastasis of E-mail at an Academic Medical Center,” identifies a significant opportunity cost.  Think twice about sending that email to everybody! Here’s the link (from John Pohl’s twitter feed): http://dlvr.it/4lD22K 

“If 30 seconds were spent per e-mail, the annual cost per physician to read these mass distribution emails was $1641.”  If 90 seconds each, then $4923.