The Harrod Domar model is more of a one Sector Model, with economic growth being determined by policies that enhance savings and technology advancements. The economic trajectory of India has come through different phases of planned interventions. As far as the investment models are concerned India, at different stages adopted different models. In this section, we will discuss the Harrod Domar Model. The model stressed the importance of savings in bringing about economic growth which has its own advantages and disadvantages.

What is Harrod Domar Model?

• The Harrod Domar Model is a Keynesian model of economic growth in development economics, developed by F. Harrod in 1939 and Evsey Domar in 1946.
• The model focused on understanding economic instability by analyzing the dynamic nature of capital and investment.
• It implies that there is no natural need for an economy's growth to be balanced.
• Major economic determinants like natural resources, population, technological growth, etc. constantly influence two important factors influencing growth:
  • Rate of investment
  • Capital-Output ratio
• Thus the relation between these two factors in bringing about economic growth was identified as follows:
  • Growth rate = Investment * (1/capital output ratio)
• Let us consider a few examples:
  • If the savings rate is 10% and the capital-output ratio is 2, then a country would grow at 5% per year.
  • If the savings rate is 20% and the capital-output ratio is 1.5, then a country would grow at 13.3% per year.

Relevance of Harrod Domar Model

• The model was devised for the developed countries to protect themselves from chronic unemployment
• The model focused on the correct input-output ratio and a high rate of propensity to save. More the investment in capital, more employment will be generated and thereby economic growth.
• The Model, however, realized that the developing countries were incapable of investing more in capital stock and therefore unable to come out of a slow growth rate.
• The Model believed in the virtuous cycle of increased savings transforming into increased investments which results in higher capital stock causing higher economic growth.

Limitations of the model

• It is difficult to increase the savings ratio in low-income countries. Savings propensities are poor in many developing countries. Instead of being preserved, extra income is frequently spent on greater spending. Many countries have a chronic savings gap at home.
• A sound financial system is lacking in many emerging countries. Increased family savings does not necessarily imply that enterprises will be able to borrow more money to invest.
• Due to human capital deficiencies, efficiency gains that reduce the capital/output ratio are difficult to achieve in developing countries, allowing capital to be employed inefficiently.
• R&D required to enhance the capital/output ratio is frequently underfunded, which is a source of market failure.
• Borrowing from abroad to make up for a shortfall in funds leads to external debt repayment issues later.
• The accumulation of capital will increase if the economy begins to grow dynamically – a rise in capital spending is not always a pre-condition for economic growth and development – as a country becomes wealthier, incomes rise, saving rises, and the higher income fuels rising demand, which in turn prompts a rise in capital investment spending.

Conclusion

Because it is built on a laissez-faire philosophy, the Harrod Domar model does not incorporate the function of government in affecting the economic growth process. As a result, it is irrelevant for growing economies, especially those in which the government plays a dominant role, such as India and China. Because HDM is based on aggregates, it cannot reveal the interrelationships across sectors and thus cannot show structural changes.

FAQs

MCQs

1. Which of the following is a key determinant of growth in the Harrod-Domar Model?

A. Population growth
B. Savings and investment
C. Government spending
D. Taxation policies

2. What is the basic formula of the Harrod-Domar Model?

A. Growth Rate = Capital-Output Ratio / Investment
B. Growth Rate = Investment * Capital-Output Ratio
C. Growth Rate = Investment / Capital-Output Ratio
D. Growth Rate = Savings / Capital-Output Ratio

3. The ‘knife-edge problem’ in the Harrod-Domar Model refers to:

A. Stable economic growth
B. Economic instability when growth deviates from equilibrium
C. Capital-output efficiency
D. High savings rates

4. What does the capital-output ratio represent in the Harrod-Domar Model?

A. The amount of capital required to produce one unit of output
B. The amount of labor needed to produce one unit of output
C. The amount of investment needed to maintain equilibrium growth
D. The amount of government spending required to boost growth

5. Which of the following is a limitation of the Harrod-Domar Model?

A. It assumes technological change
B. It accounts for labor productivity
C. It assumes a fixed capital-output ratio
D. It includes government intervention in the economy

GS Mains Questions and Model Answers

Q1: Critically examine the relevance of the Harrod-Domar Model for developing economies like India.

Answer: While the Harrod-Domar Model highlights the importance of savings and investment in driving economic growth, its application to developing economies like India is limited. The model's assumptions of a fixed capital-output ratio and no technological advancements do not reflect the realities of modern economies. Moreover, in low-income countries, achieving high savings rates is difficult due to low disposable incomes. Despite these limitations, the model emphasizes the need for capital accumulation, which remains relevant for economic planning.

Q2: Explain the concept of 'knife-edge instability' in the Harrod-Domar Model. How can it impact economic growth?

Answer: The ‘knife-edge instability’ refers to the delicate balance required between actual and expected growth rates in the Harrod-Domar Model. Any deviation from the equilibrium growth rate can lead to either inflation or unemployment. In practical terms, this implies that economies must maintain balanced investment and savings levels to avoid instability, which can result in boom-bust cycles.

Q3: Discuss the limitations of the Harrod-Domar Model in explaining long-term economic growth.

Answer: The Harrod-Domar Model's primary limitations include its assumption of a constant capital-output ratio and its exclusion of technological progress. Long-term economic growth is often driven by innovation and productivity improvements, which the model does not account for. Additionally, the model's focus on investment neglects other factors like human capital development, infrastructure, and institutional frameworks that are critical for sustained growth.

Previous Year Questions on Harrod-Domar Model

1. UPSC CSE Prelims 2020

Question: What is the relationship between savings and growth in the Harrod-Domar Model?
A. Growth is inversely related to savings
B. Growth is directly proportional to savings
C. Growth is unrelated to savings
D. Savings affect only short-term growth

Answer: B

Explanation: According to the Harrod-Domar Model, higher savings lead to higher investment, which in turn fosters economic growth.

2. UPSC CSE Mains 2018 (GS Paper 3)

Question: Analyze the role of investment in driving economic growth as per the Harrod-Domar Model.

Answer: The Harrod-Domar Model posits that investment is a key driver of economic growth. It links growth to the capital-output ratio and savings rate, suggesting that increased investment in capital-intensive sectors boosts production capacity and overall economic expansion. However, in developing economies, limitations like low savings rates and inefficiencies in capital use often hinder the expected growth outcomes.