Where the words come from
Growth as the percentage change in real GDP, recessions, peaks, troughs and the business cycle, productivity growth shifting potential GDP, the long-run record of growth, and the limits of GDP as a measure of living standards, and the sources of productivity growth — Principles of Economics 2e, OpenStax, licensed CC BY 4.0. https://openstax.org/books/principles-economics-2e/pages/19-3-tracking-real-gdp-over-time and https://openstax.org/books/principles-economics-2e/pages/24-5-how-the-ad-as-model-incorporates-growth-unemployment-and-inflation and https://openstax.org/books/principles-economics-2e/pages/20-1-the-relatively-recent-arrival-of-economic-growth and https://openstax.org/books/principles-economics-2e/pages/19-5-how-well-gdp-measures-the-well-being-of-society and https://openstax.org/books/principles-economics-2e/pages/20-2-labor-productivity-and-economic-growth. Changes: The US business-cycle record and annualisation convention dropped; "about 2% per year" for GDP per head over two centuries kept from 20.1; the limits of GDP condensed from 19.5; "potential growth" is the UK name for 2e's long-run shift in potential GDP; the example, the recovery test's two questions and the UK two-quarter recession convention are ours; British spelling; the cycle sentence follows 19.3, a recession runs from peak to trough and an upswing from trough to peak, so real GDP rises to a peak (an earlier draft said "from a peak"); the causes of growth set out in our own words: the short-run cause from aggregate demand, and the long-run causes from 20.2's sources of productivity growth (physical capital, human capital and technology) plus a growing labour force.
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