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Marginal Propensity to Import Calculator

Measure how much imports change when national income changes.

Runs locally

Inputs and results stay in this browser. Currency symbols are illustrative; use any consistent currency.

Marginal propensity to import0.2

Understand Marginal propensity to import

One idea, three depths

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Marginal propensity to import: Measure how much imports change when national income changes.

Age 5Explain it to a 5-year-oldStart with a picture

Imagine using Marginal propensity to import to answer this question: measure how much imports change when national income changes? Enter Initial income, New income, Initial imports, and 1 other input; the calculator shows Marginal propensity to import. Try changing one number and watch what happens to Marginal propensity to import. The answer tells you Marginal propensity to import.

Age 15Explain it to a 15-year-oldConnect it to the formula

The result estimates the share of an additional unit of income spent on imports over the observed interval. The rule is Marginal propensity to import = Change in imports ÷ change in income. Its input values are Initial income (bn), New income (bn), Initial imports (bn), New imports (bn), and the main result is Marginal propensity to import. Try changing one number and watch what happens to Marginal propensity to import.

CollegeExplain it at college levelState the model precisely

This calculator evaluates a macroeconomics relationship while holding unmodelled conditions constant. The implemented relation is Marginal propensity to import = Change in imports ÷ change in income, evaluated from Initial income (bn), New income (bn), Initial imports (bn), New imports (bn) to produce Marginal propensity to import. The result estimates the share of an additional unit of income spent on imports over the observed interval. 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

Measure how much imports change when national income changes.

Why this relationship is useful

The result estimates the share of an additional unit of income spent on imports over the observed interval.

Inputs that must be comparable

  • Initial income measured in bn.
  • New income measured in bn.
  • Initial imports measured in bn.
  • New imports measured in bn.

Use one market, firm, population and time period throughout; mixing definitions can make a correctly calculated number economically meaningless.

The model

Marginal propensity to import = Change in imports ÷ change in income

From inputs to output

The calculator combines Initial income, New income, Initial imports, New imports and reportsMarginal propensity to import. Change one assumption at a time to identify what actually drives the estimate.

How to read Marginal propensity to import

Read the sign, magnitude, unit and period together. The result quantifies the relationship in “measure how much imports change when national income changes”; 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.

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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 textbook
Cite 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.

Organizational author: MW SysArc. Published:. Canonical page:https://economics.mwsysarc.com/macro/marginal-propensity-to-import.

APA 7

MW SysArc. (2026, July 21). Marginal Propensity to Import Calculator. MW SysArc Tools. https://economics.mwsysarc.com/macro/marginal-propensity-to-import

MLA 9

MW SysArc. “Marginal Propensity to Import Calculator.” MW SysArc Tools, 21 July 2026, https://economics.mwsysarc.com/macro/marginal-propensity-to-import. Accessed 31 Aug. 2026.

Chicago 17

MW SysArc. “Marginal Propensity to Import Calculator.” MW SysArc Tools. Published July 21, 2026. Accessed August 31, 2026. https://economics.mwsysarc.com/macro/marginal-propensity-to-import.

Harvard

MW SysArc (2026) ‘Marginal Propensity to Import Calculator’, MW SysArc Tools. Published 21 July 2026. Available at: https://economics.mwsysarc.com/macro/marginal-propensity-to-import (Accessed: 31 August 2026).

BibTeX and RIS records

BibTeX

@misc{mwsysarc_marginal_propensity_import_2026,
  author = {{MW SysArc}},
  title = {Marginal Propensity to Import Calculator},
  howpublished = {MW SysArc Tools},
  year = {2026},
  url = {https://economics.mwsysarc.com/macro/marginal-propensity-to-import},
  note = {Published July 21, 2026; accessed August 31, 2026}
}

RIS

TY  - ELEC
AU  - MW SysArc
TI  - Marginal Propensity to Import Calculator
T2  - MW SysArc Tools
PY  - 2026
DA  - 2026-07-21
Y2  - 2026-08-31
UR  - https://economics.mwsysarc.com/macro/marginal-propensity-to-import
N1  - Published July 21, 2026
ER  -

Clear answers

Frequently asked questions

What does the Marginal propensity to import do?

Measure how much imports change when national income changes.

How does the Marginal propensity to import work?

The calculator applies this formula: Marginal propensity to import = Change in imports ÷ change in income. The result estimates the share of an additional unit of income spent on imports over the observed interval.

What can I learn from the Marginal propensity to import?

It helps you explore the relationship described by this tool: Measure how much imports change when national income changes. 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 .

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