What is Investment Multiplier

Investment multiplier in Keynesian economics explains how an initial investment boost leads to larger overall rise in national income, driving economic growth.
Grow Your Money with a High-Interest Bajaj Finance FD
4 min
31-October-2025

Every rupee invested has a ripple effect on the economy — it creates jobs, boosts demand, and increases income levels. This phenomenon is explained by the investment multiplier, an important concept in economics that measures how an initial investment leads to a larger overall rise in national income.

When businesses or governments invest in new projects, they not only create direct benefits but also trigger a chain of indirect economic activities. For individuals, the same principle applies — a well-placed investment like a Fixed Deposit (FD) can steadily multiply your savings through compounding interest.

Multiply your savings with guaranteed returns. Open a Bajaj Finance Fixed Deposit today and enjoy assured growth with complete safety. Open FD Account.

How does the investment multiplier work?

The investment multiplier works by magnifying the impact of an initial investment on the economy. When businesses or governments invest, it creates new jobs and income, leading to increased spending and further economic expansion. The process continues in multiple cycles, boosting overall economic output.

  1. Initial investment – When an investment is made in infrastructure, industries, or businesses, it creates new demand for goods and services.
  2. Income generation – Investment increases employment opportunities, raising income levels for workers and suppliers.
  3. Higher consumption – People with higher incomes spend more on goods and services, increasing demand.
  4. Increased production – Businesses respond to higher demand by increasing production, leading to more investments in capital and resources.
  5. More employment – Increased production creates more job opportunities, further boosting income levels.
  6. Additional investments – As businesses expand, they invest in technology, infrastructure, and workforce development.
  7. Multiplier effect continues – The cycle repeats as higher demand and spending drive economic growth.
  8. Economic expansion – The overall impact of the initial investment multiplies, leading to sustained economic growth.
  9. Government role – Policymakers use investment multipliers to design fiscal policies that enhance economic development.

Just as one investment drives multiple benefits in the economy, a Bajaj Finance FD can create a steady flow of income through monthly or quarterly payouts. Check FD Rates.

Pro tip

Bajaj Finance offers attractive Fixed Deposit interest rates of up to 6.95% p.a. for non-senior citizens, and up to 7.30% p.a. for senior citizens, inclusive of an additional rate benefit of up to 0.35% p.a.

Why is the investment multiplier important?

The investment multiplier is crucial for assessing how effective fiscal and investment policies are in driving growth. A higher multiplier means a small investment can produce a significant increase in national income.

For example:

  • Governments use this concept to plan public spending in infrastructure, education, and healthcare.
  • Businesses rely on it to gauge how investments can boost production and profitability.
  • Economists track it to forecast GDP growth and recovery trends.

In developing economies like India, where large-scale government projects create millions of jobs, the multiplier effect has been a key driver of inclusive growth.

Similarly, individuals can achieve long-term financial stability through disciplined investing. Choosing secure instruments like FDs can help ensure consistent and risk-free growth of capital.

Make your money work harder — invest in a Bajaj Finance Fixed Deposit for predictable, high returns and total peace of mind. Check Eligibility.

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How investment multiplier is calculated?

The investment multiplier is calculated using a formula that measures the ratio of total income generated to the initial investment. This helps economists and policymakers determine the extent of economic expansion caused by new investments.

Investment multiplier formula – The basic formula is Multiplier (K) = 1 / (1 - MPC), where MPC (Marginal Propensity to Consume) represents the proportion of additional income spent on consumption.

Understanding MPC – A higher MPC means people spend more of their additional income, leading to a higher multiplier effect.

Impact on national income – The formula shows how a small increase in investment results in a multiplied increase in overall income.

Use in economic planning – Governments use the multiplier concept to estimate the impact of fiscal policies on GDP growth.

Relation with savings – Since MPS (Marginal Propensity to Save) = 1 - MPC, a lower MPS leads to a higher multiplier.

Influence of economic conditions – The multiplier effect is stronger in economies where consumer spending is high and leakages (such as savings or imports) are minimal.

Example calculation

An example of the investment multiplier helps illustrate how a small investment can lead to a significant increase in national income. The formula-based approach explains its practical application in real-world scenarios.

Example 1 – Small investment impact – If the MPC is 0.8, the multiplier is 1 / (1 - 0.8) = 5. This means an initial investment of Rs.1 crore will increase total income by Rs.5 crore.

Example 2 – Real-world application – Suppose the government invests Rs. 500 crore in infrastructure. If the MPC is 0.75, the multiplier is 1 / (1 - 0.75) = 4. This means the total increase in national income would be Rs. 500 crore × 4 = Rs.2,000 crore.

Just as the multiplier amplifies economic growth, compounding in an FD amplifies your wealth over time. Start investing with Bajaj Finance FD to experience steady, risk-free growth.

Conclusion

The investment multiplier explains how one investment triggers a chain of positive economic outcomes — from higher income and employment to greater national output. It’s a cornerstone of fiscal planning and a key indicator of an economy’s responsiveness to policy changes.

For individuals, the same principle applies: one wise investment can pave the way for financial stability. A Bajaj Finance Fixed Deposit offers assured returns, safety, and flexibility, helping you achieve your long-term financial goals while keeping your capital secure. Open FD.

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Frequently asked questions

What is the ratio of investment multiplier?
Can I earn regular income from my FD?

Yes. You can choose the Monthly Interest Payout option in a Bajaj Finance FD to receive interest every month, similar to earning regular income from an investment. Book FD.

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Disclaimer

As regards deposit taking activity of Bajaj Finance Ltd (BFL), the viewers may refer to the advertisement in the Indian Express (Mumbai Edition) and Loksatta (Pune Edition) furnished in the application form for soliciting public deposits or refer https://www.bajajfinserv.in/fixed-deposit-archives The company is having a valid Certificate of Registration dated March 5, 1998 issued by the Reserve Bank of India under section 45 IA of the Reserve Bank of India Act, 1934. However, the RBI does not accept any responsibility or guarantee about the present position as to the financial soundness of the company or for the correctness of any of the statements or representations made or opinions expressed by the company and for repayment of deposits/discharge of the liabilities by the company.

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