Where the words come from
The expenditure multiplier, the rounds of re-spending, taxes, saving and imports as leakages, the multiplier formula, and the worked example of a 2.13 multiplier; the marginal propensities to save and to import — Principles of Economics 2e, OpenStax, licensed CC BY 4.0. https://openstax.org/books/principles-economics-2e/pages/d-the-expenditure-output-model and https://openstax.org/books/principles-economics-2e/pages/25-2-the-building-blocks-of-keynesian-analysis. Changes: The $100 government spending example converted to £100 million, with "save 10% of after-tax income" restated as 7p of each gross pound so the leakages add in the UK way; the result, a multiplier of 2.13 and £213 million, is 2e's and comes out the same; the formula written as 1 ÷ (MPS + MPT + MPM); the investment collapse of the Great Depression generalised; the MPS and MPI definitions moved from "the additional dollar" to "each extra pound", with the MPI given its UK name, the MPM; the MPT card ours (untagged), from 2e's tax rate as a share of income; the card examples, mistake note, exam tip and checks ours; British spelling.
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