Macroeconomics
Deposit Expansion Calculator
Estimate maximum textbook deposit expansion from an initial reserve injection.
Inputs and results stay in this browser. Currency symbols are illustrative; use any consistent currency.
Understand Deposit expansion
One idea, three depths
Choose how deeply to explain Deposit expansion
Estimate maximum textbook deposit expansion from an initial reserve injection.
Age 5Explain it to a 5-year-oldStart with a picture
Imagine using Deposit expansion to answer this question: estimate maximum textbook deposit expansion from an initial reserve injection? Enter Initial new reserves and Reserve ratio; the calculator shows Maximum total deposits. Try changing one number and watch what happens to Maximum total deposits. The answer tells you Maximum total deposits.
Age 15Explain it to a 15-year-oldConnect it to the formula
The result is a theoretical ceiling under strong assumptions, not a forecast of bank lending. The rule is Maximum deposits = Initial reserves × (1 ÷ reserve ratio). Its input values are Initial new reserves, Reserve ratio (%), and the main result is Maximum total deposits. Try changing one number and watch what happens to Maximum total deposits.
CollegeExplain it at college levelState the model precisely
This calculator evaluates a macroeconomics relationship while holding unmodelled conditions constant. The implemented relation is Maximum deposits = Initial reserves × (1 ÷ reserve ratio), evaluated from Initial new reserves, Reserve ratio (%) to produce Maximum total deposits. The result is a theoretical ceiling under strong assumptions, not a forecast of bank lending. The result depends on comparable definitions, units, populations and time periods. It estimates a relationship; it does not establish causation or replace current primary data.
The economic question
Estimate maximum textbook deposit expansion from an initial reserve injection.
Why this relationship is useful
The result is a theoretical ceiling under strong assumptions, not a forecast of bank lending.
Inputs that must be comparable
- Initial new reserves (minimum 0).
- Reserve ratio (minimum 0.01) measured in %.
Use one market, firm, population and time period throughout; mixing definitions can make a correctly calculated number economically meaningless.
The model
Maximum deposits = Initial reserves × (1 ÷ reserve ratio)
From inputs to output
The calculator combines Initial new reserves, Reserve ratio and reportsMaximum total deposits together with Maximum additional deposits. Change one assumption at a time to identify what actually drives the estimate.
How to read Maximum total deposits
Read the sign, magnitude, unit and period together. The result quantifies the relationship in “estimate maximum textbook deposit expansion from an initial reserve injection”; it does not by itself prove that one input caused another.
Where interpretation can fail
Do not use the result when the input definitions, units or formula assumptions do not match the real situation. This is an educational model, not financial, investment, tax or policy advice; verify material decisions against primary data and professional guidance.
Supporting sourcesAcademic referencesPrimary standards, textbooks and complete citations
Standards, reading and academic references
Use the calculator as the worked interaction, then consult the primary standards and academic textbooks listed below. MW SysArc links to the original sources; the explanation on this page is original and does not reproduce them.
Principles of Economics 3e
Read the free OpenStax economics textbookCite this book
- APA 7
- Greenlaw, S. A., Shapiro, D., & MacDonald, D. (2022). Principles of economics 3e. OpenStax. https://openstax.org/books/principles-economics-3e/pages/1-introduction
- MLA 9
- Greenlaw, Steven A., et al. Principles of Economics 3e. OpenStax, 2022, https://openstax.org/books/principles-economics-3e/pages/1-introduction.
- Chicago author-date
- Greenlaw, Steven A., David Shapiro, and Daniel MacDonald. 2022. Principles of Economics 3e. Houston, TX: OpenStax. https://openstax.org/books/principles-economics-3e/pages/1-introduction.
OpenStax entries are free to read online. Follow the licence shown on each linked source before redistributing or adapting its content.
Reuse the page responsiblyCite this pageAPA, MLA, Chicago, Harvard, BibTeX and RIS
These formats cite this calculator page itself. They are separate from the academic references above, which support the mathematical method and terminology.
APA 7
MW SysArc. (2026, July 21). Deposit Expansion Calculator. MW SysArc Tools. https://economics.mwsysarc.com/macro/deposit-expansion
MLA 9
MW SysArc. “Deposit Expansion Calculator.” MW SysArc Tools, 21 July 2026, https://economics.mwsysarc.com/macro/deposit-expansion. Accessed 31 Aug. 2026.
Chicago 17
MW SysArc. “Deposit Expansion Calculator.” MW SysArc Tools. Published July 21, 2026. Accessed August 31, 2026. https://economics.mwsysarc.com/macro/deposit-expansion.
Harvard
MW SysArc (2026) ‘Deposit Expansion Calculator’, MW SysArc Tools. Published 21 July 2026. Available at: https://economics.mwsysarc.com/macro/deposit-expansion (Accessed: 31 August 2026).
BibTeX and RIS records
BibTeX
@misc{mwsysarc_deposit_expansion_2026,
author = {{MW SysArc}},
title = {Deposit Expansion Calculator},
howpublished = {MW SysArc Tools},
year = {2026},
url = {https://economics.mwsysarc.com/macro/deposit-expansion},
note = {Published July 21, 2026; accessed August 31, 2026}
}RIS
TY - ELEC
AU - MW SysArc
TI - Deposit Expansion Calculator
T2 - MW SysArc Tools
PY - 2026
DA - 2026-07-21
Y2 - 2026-08-31
UR - https://economics.mwsysarc.com/macro/deposit-expansion
N1 - Published July 21, 2026
ER -Clear answers
Frequently asked questions
What does the Deposit expansion do?
Estimate maximum textbook deposit expansion from an initial reserve injection.
How does the Deposit expansion work?
The calculator applies this formula: Maximum deposits = Initial reserves × (1 ÷ reserve ratio). The result is a theoretical ceiling under strong assumptions, not a forecast of bank lending.
What can I learn from the Deposit expansion?
It helps you explore the relationship described by this tool: Estimate maximum textbook deposit expansion from an initial reserve injection. Change one input at a time to observe how it affects the result.
Does MW SysArc receive or store what I enter?
No. The calculation runs locally in your browser. MW SysArc does not receive or store your calculation inputs.
How should I use the result?
Use the result as an estimate or educational aid. Check important financial, business or policy decisions with qualified sources and current data.
Last reviewed . Calculations tested .