In another leading textbook, this is a footnote to a comment on how some groups use “Rules of Thumb” to allocate a good or service:
Sensitivity check. Although this phrase has been associated with the shocking idea that a husband can beat his wife so long as the stick is no thicker than his thumb, the more likely source is the historical use of body parts as rules to measure things.
Thanks for that. I expect subsequent editions to include chapters on, “How to Play Nice,” “Why Johnny Should Share Toys with Timmy,” and “It’s OK to Cry if you Don’t Get What You Want.” There ar, however, a good many excellent chapters in this same book.