Where the words come from
The upward-sloping supply of labour, the labour-leisure trade-off, the nurses example, the factors that shift labour supply, and the income and substitution effects of a wage rise — Principles of Economics 2e, OpenStax, licensed CC BY 4.0. https://openstax.org/books/principles-economics-2e/pages/4-1-demand-and-supply-at-work-in-labor-markets and https://openstax.org/books/principles-economics-2e/pages/b-indifference-curves and https://openstax.org/books/principles-economics-2e/pages/14-1-the-theory-of-labor-markets. Changes: Minneapolis-St. Paul nurses made an unnamed city; Table 4.3's three rows put into prose; "primary care physicians" to "GPs"; the Petunia indifference-curve example reduced to its conclusion about income and substitution effects; the market-supply sentence from section 14.1 added; "labor" to "labour" and British spelling throughout; anatomy 4: Table 4.3's three rows (number of workers, required education, government policies) made into concept cards, each definition recast from the table's text, with "immigration" to "migration", the number-of-workers example taken from the table's own point about more women working outside the home, and "nursing schools or nursing students" to a training payment; the income and substitution effects now named before they are explained.
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