Cheatsheet source:

https://en.wikipedia.org/wiki/Total_factor_productivity#cite...

For the adventurous/curious:

https://www.bls.gov/dpr/faqs.htm

http://www.helsinki.fi/iehc2006/papers2/Warr.pdf [PDF]

https://assets.cambridge.org/97811070/36161/frontmatter/9781... [PDF]