Where the words come from
What a shift in supply means, the distinction from a movement along the curve, the factors that shift supply through the cost of production, and the direction of each shift — Principles of Economics 2e, OpenStax, licensed CC BY 4.0. https://openstax.org/books/principles-economics-2e/pages/3-2-shifts-in-demand-and-supply-for-goods-and-services. Changes: "good or service" shortened to "good" in places; the curve labels kept as S0, S1 and S2; the factors that shift supply recast as cards, with the steel, drought, Green Revolution, tax, regulation and subsidy passages condensed; the wine, bus, book and safety examples invented; British spelling; the related-goods-in-production card (competitive and joint supply), its wheat, barley, beef and leather example, and the intro wording are ours, added for the UK specification; the mistake note and recap name the prices of related goods in production alongside the cost of production.
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