Where the words come from
The circular flow of households and firms in the goods and factor markets, the income measure of GDP, and saving, taxes and imports as leakages — Principles of Economics 2e, OpenStax, licensed CC BY 4.0. https://openstax.org/books/principles-economics-2e/pages/1-3-how-economists-use-theories-and-models-to-understand-economic-issues and https://openstax.org/books/principles-economics-2e/pages/d-the-expenditure-output-model and https://openstax.org/books/principles-economics-2e/pages/19-1-measuring-the-size-of-the-economy-gross-domestic-product. Changes: The circular flow description condensed, with land, capital and enterprise named as the factors; the arrow labels A to D and the figure dropped; the leakages passage ("spending on savings, taxes, and imports") taken from the multiplier discussion, applied to the flow and split into one card per leakage, with the card definitions of saving, taxation and imports written by us from it and left untagged; "withdrawals" dropped; the injections block, the three pairs and the growth condition in the recap are ours; the ISA, Bristol, Sunderland and South Korean television examples invented; British spelling.
The question and the page layout are our own.