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Rebuild a two-month budget and find the assumption that changes it

Recalculate this lesson’s invented two-month budgets. Compare income of 100 and 100 credits with 100 and 140. First allow cost-free borrowing with certain future income and a preference for equal spending; then forbid borrowing and assume zero initial savings. Explain exactly why one preferred plan becomes infeasible. Optionally verify the separate purchasing-power fraction 105/103 and connect one concept to the original source.

A useful result: A short English table of income, spending, borrowing or saving and final balance for each case, the explicit changed assumption, the exact source/version context, and one next check. Label all classroom inputs and distinguish feasibility from an empirically observed choice.

Use invented inputs and public sources. No personal financial recommendations, market predictions or claims that this reproduces a laureate’s full model. Keep assumptions, arithmetic, historical attribution and evidence separate. A source limitation or a failed extension is a valid partial result.

WRS economics teaching chapter for edition 2026-10-14.1. Award source, 12 October 2026: https://www.kva.se/en/news/the-prize-in-economic-sciences-2026/ . Hall’s original article: Journal of Political Economy 86(6), 971–987, December 1978; publisher date 1978-12-01, DOI 10.1086/260724. Woodford’s Interest and Prices: Foundations of a Theory of Monetary Policy is a 2003 book; author-hosted front matter and contents: https://www.columbia.edu/~mw2230/InterestandPrices.pdf . The book preview is not the full book. The budget and price examples are WRS classroom constructions. Suggested work is independent of the award organisations and laureates. WRS Frontier edition 2026-10-17.1; briefing nobel-economics-2026-expectations. Source publication 2026-10-12.

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  "profile": "wrs-frontier-question-draft-1",
  "title": "Rebuild a two-month budget and find the assumption that changes it",
  "category": "research",
  "question": "Recalculate this lesson’s invented two-month budgets. Compare income of 100 and 100 credits with 100 and 140. First allow cost-free borrowing with certain future income and a preference for equal spending; then forbid borrowing and assume zero initial savings. Explain exactly why one preferred plan becomes infeasible. Optionally verify the separate purchasing-power fraction 105/103 and connect one concept to the original source.",
  "constraints": "Use invented inputs and public sources. No personal financial recommendations, market predictions or claims that this reproduces a laureate’s full model. Keep assumptions, arithmetic, historical attribution and evidence separate. A source limitation or a failed extension is a valid partial result.",
  "success_criteria": "A short English table of income, spending, borrowing or saving and final balance for each case, the explicit changed assumption, the exact source/version context, and one next check. Label all classroom inputs and distinguish feasibility from an empirically observed choice.",
  "context": "WRS economics teaching chapter for edition 2026-10-14.1. Award source, 12 October 2026: https://www.kva.se/en/news/the-prize-in-economic-sciences-2026/ . Hall’s original article: Journal of Political Economy 86(6), 971–987, December 1978; publisher date 1978-12-01, DOI 10.1086/260724. Woodford’s Interest and Prices: Foundations of a Theory of Monetary Policy is a 2003 book; author-hosted front matter and contents: https://www.columbia.edu/~mw2230/InterestandPrices.pdf . The book preview is not the full book. The budget and price examples are WRS classroom constructions. Suggested work is independent of the award organisations and laureates.\nWRS Frontier edition 2026-10-17.1; briefing nobel-economics-2026-expectations. Source publication 2026-10-12.",
  "publication_consent": false
}

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