Where the words come from
The definition of labour productivity as output per unit of labour input, per worker or per hour worked, and the link between labour productivity and capital per worker — Productivity and competition: a summary of the evidence (CMA45, 2015), Competition and Markets Authority, GOV.UK, Open Government Licence v3.0. https://www.gov.uk/government/publications/productivity-and-competition-a-summary-of-the-evidence. Changes: Annex A paragraph A.7 condensed into one sentence; "high capital per worker" used for the capital clause in the first explain block.
What unit labour costs are, how they are calculated, what labour costs include, how they move with labour costs per hour and output per hour, and labour costs' share of the cost of UK output — Unit labour costs, UK: October to December 2019, Office for National Statistics, Open Government Licence v3.0. https://www.ons.gov.uk/employmentandlabourmarket/peopleinwork/labourproductivity/bulletins/unitlabourcostsuk/octobertodecember2019. Changes: "the ratio of total labour costs to gross value added (GVA), or equivalently the ratio of hourly labour costs to output per hour" put as two divisions, with gross value added as output; "social security" contributions named as National Insurance; "goes up as salary, bonuses, employer contributions and other direct labour costs per hour rise, and falls as output per hour increases" condensed; "around two-thirds of the overall cost of production of UK economic output" and "an indicator of inflationary pressure" recast; the two-thirds figure dated to the bulletin's release in April 2020; the recap's closing clause is ours.
Labour productivity calculated by dividing output by labour input, with labour input as workers, jobs or hours worked — Labour productivity, UK: January to March 2018, Office for National Statistics, Open Government Licence v3.0. https://www.ons.gov.uk/employmentandlabourmarket/peopleinwork/labourproductivity/bulletins/labourproductivity/januarytomarch2018. Changes: "Labour productivity is calculated by dividing output by labour input" kept as the first sentence of the first explain block; jobs as a third measure of labour input left out.
The determinants of labour productivity: human capital, technological change and economies of scale — Principles of Economics 2e, OpenStax, licensed CC BY 4.0. https://openstax.org/books/principles-economics-2e/pages/20-2-labor-productivity-and-economic-growth. Changes: The three determinants condensed into one sentence, with "accumulated knowledge (from education and experience), skills, and expertise" as "the knowledge and skills workers bring"; the part-time example, the worked example, the checks, the mistake note and the exam tip are ours, with illustrative figures in pounds; British spelling.
Questions, options, diagrams and feedback are our own. Figures credited to a source above are that source's; every other figure is invented to show the method.