http://www.economist.com/blogs/gulliver/2015/10/service-comp...
But even more to your point... https://www.bna.com/no-tipping-fewer-b57982065202/
http://www.economist.com/blogs/gulliver/2015/10/service-comp...
But even more to your point... https://www.bna.com/no-tipping-fewer-b57982065202/