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Dosa Economics: A Simple Explanation of Inflation and Interest Rates

Editor : Ankita Kumari ||

In the world of economics, many theories and concepts are often complex and difficult to understand. However, one theory that stands out for its simplicity and relatability is Dosa Economics, coined by former Reserve Bank of India (RBI) Governor, Raghuram Rajan. During his tenure, Rajan faced a challenging economic environment, with high inflation and high interest rates. His innovative way of explaining the impact of inflation and interest rates on purchasing power through the analogy of dosas has made economic principles more accessible to the common man. This article aims to delve into Dosa Economics, its implications, and how it relates to the broader economic context.

The Genesis of Dosa Economics

Raghuram Rajan served as the Governor of the RBI during a period marked by significant economic challenges, including high inflation and high-interest rates. Amidst these challenges, one of Rajan’s notable actions was the reduction of interest rates on fixed deposits from 10% to 8% when the inflation rate fell to 5%. This decision, while economically sound, was met with criticism, especially from senior citizens who relied heavily on fixed deposit returns for their income.

In response to the backlash, Rajan introduced the concept of Dosa Economics to explain the relationship between interest rates, inflation, and purchasing power in a manner that was easy to understand. The principle of Dosa Economics is that high-interest rates during high inflation do not benefit investors as much as low-interest rates during low inflation. This concept is pivotal in understanding the real value of money and how inflation impacts purchasing power.

 The Basics of Dosa Economics

To understand Dosa Economics, let’s start with the basic concept that Rajan introduced. The essence of Dosa Economics lies in comparing the purchasing power of money in different inflationary environments. Rajan used the example of a pensioner who loves dosas, a popular South Indian dish, to illustrate his point.

Imagine a pensioner with savings of ₹1,00,000, which he invests in a fixed deposit (FD). The interest rate offered by the bank is 10%, and the inflation rate is also 10%. At the beginning of the year, the price of one dosa is ₹50. With ₹1,00,000, the pensioner can buy 2,000 dosas immediately. However, he decides to invest his money to earn interest.

At the end of the year, the pensioner’s investment grows to ₹1,10,000 (principal + interest). But due to 10% inflation, the price of one dosa also increases to ₹55. Now, with ₹1,10,000, the pensioner can still buy only 2,000 dosas (₹1,10,000 / ₹55). Despite earning interest, the pensioner’s purchasing power remains unchanged because the inflation rate matched the interest rate.

The Impact of Lower Inflation and Interest Rates

Now, let’s consider a scenario with lower inflation and interest rates. Suppose the bank offers an 8% interest rate, and the inflation rate is 5%. At the beginning of the year, the pensioner can buy 2,000 dosas with ₹1,00,000. After investing his money, the pensioner earns ₹8,000 in interest, making his total savings ₹1,08,000.

With a 5% inflation rate, the price of one dosa increases to ₹52.75 at the end of the year. Now, with ₹1,08,000, the pensioner can buy approximately 2,048 dosas (₹1,08,000 / ₹52.75). In this scenario, the pensioner’s purchasing power has increased because the inflation rate is lower than the interest rate.

 The Broader Economic Implications

Dosa Economics not only simplifies the understanding of interest rates and inflation but also underscores a critical economic principle: inflation is the silent killer. High nominal interest rates may seem attractive, but when adjusted for inflation, the real returns can be negligible or even negative. Conversely, lower nominal interest rates in a low inflation environment can yield positive real returns, enhancing purchasing power.

This principle is crucial for policymakers, investors, and the general public to understand, as it highlights the importance of maintaining low and stable inflation for sustained economic growth and improved living standards.

Why do we need to know about Dosa Economics?

For MBA students, understanding Dosa Economics is particularly relevant as it ties directly into financial management, investment strategies, and economic policymaking. Let’s consider a scenario that we MBA students can relate to:

Imagine a group of MBA students managing an investment fund. They have the option to invest in fixed deposits or in equity markets. In a high-interest, high-inflation environment, the fixed deposit returns may appear attractive nominally, but when adjusted for inflation, the real returns could be negligible. On the other hand, in a low-interest, low-inflation scenario, the fixed deposit returns may seem lower nominally, but the real returns could be positive, enhancing the fund’s purchasing power.

This understanding can help students make informed investment decisions, considering not just nominal returns but also the impact of inflation on real returns. Additionally, it emphasizes the importance of macroeconomic stability and the role of central banks in maintaining low and stable inflation.

To make Dosa Economics more relatable to MBA students, let’s consider a few practical examples. Suppose you are an MBA student with a part-time job, earning ₹20,000 per month. You decide to save ₹5,000 each month in a savings account with a 4% annual interest rate. Meanwhile, the inflation rate is 3%.

At the end of the year, you have saved ₹60,000, and with interest, your total savings amount to ₹61,200. However, due to 3% inflation, the cost of living has increased, and your expenses have risen proportionately. Despite earning interest, your real purchasing power has only slightly improved.

Now, imagine the inflation rate rises to 6%, but the interest rate on your savings remains at 4%. At the end of the year, your savings are still ₹61,200, but your expenses have increased significantly due to higher inflation. In this scenario, your real purchasing power has declined, demonstrating the importance of keeping inflation in check.

Practical Applications of Dosa Economics

To further illustrate the practical applications of Dosa Economics, let’s explore a few real-world examples and scenarios:

Personal Finance and Retirement Planning

For individuals planning their retirement, understanding the principles of Dosa Economics can be crucial in making informed decisions about their savings and investments. High-interest rates on fixed deposits may seem attractive, but if inflation is also high, the real value of their savings may not increase significantly. In contrast, investing in a diversified portfolio with lower nominal returns but in a low-inflation environment could yield better real returns and preserve purchasing power over time.

Corporate Finance and Investment Strategies

Corporations can also benefit from applying the principles of Dosa Economics in their financial planning and investment strategies. Companies often borrow funds for expansion and investment. In a high-inflation environment, the cost of borrowing may be offset by inflation, but the real cost of debt could be higher. Conversely, in a low-inflation environment, even with lower nominal interest rates, the real cost of borrowing could be lower, making it more feasible for companies to invest in growth opportunities.

Policy-Making and Economic Planning

For policymakers, Dosa Economics underscores the importance of maintaining low and stable inflation to foster economic stability and growth. High inflation can erode the purchasing power of consumers and investors, leading to economic instability. Conversely, low and stable inflation can enhance real returns, promote investment, and support sustainable economic growth.


Dosa Economics, as introduced by Raghuram Rajan, offers a simple yet profound insight into the relationship between interest rates, inflation, and purchasing power. By relating complex economic principles to something as relatable as dosas, Rajan has made it easier for people to understand the impact of inflation on real returns.

The lessons of Dosa Economics are not just limited to personal finance but extend to corporate finance, investment strategies, and economic policymaking. Understanding these principles can help individuals, businesses, and policymakers make informed decisions that enhance real returns, promote economic stability, and support sustainable growth.

As MBA students and future leaders, embracing the principles of Dosa Economics can equip you with the knowledge and insights needed to navigate the complex world of finance and economics. By considering both nominal returns and the impact of inflation, you can make more informed investment decisions, develop sound financial strategies, and contribute to the overall stability and growth of the economy.

In essence, Dosa Economics is a reminder that while nominal returns are important, the real value of money is determined by its purchasing power. By maintaining low and stable inflation, we can ensure that our savings and investments retain their real value, leading to better financial outcomes and a more stable economy.

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