Repo Rate and Inflation Rate: Analysing the Effectiveness of the Inflation Targeting Policy of the RBI in India
This paper utilizes ARDL and Toda-Yamamoto econometric models on RBI secondary data to demonstrate that India's inflation targeting policy is effective, revealing a long-run relationship where the policy repo rate unidirectionally influences monthly inflation with a one-month lag.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
Imagine the Indian economy as a giant, speeding car. The Reserve Bank of India (RBI) is the driver, and its main job is to keep the car from speeding too fast (which causes inflation, or rising prices) or stalling out (which causes deflation).
To control the speed, the driver uses a special tool called the Policy Repo Rate. Think of the Repo Rate as the "cost of fuel" for the banks.
- When the driver hits the brakes (raises the Repo Rate): It becomes more expensive for banks to borrow money. They, in turn, charge more to lend money to people and businesses. This makes people spend less, demand drops, and prices cool down.
- When the driver steps on the gas (lowers the Repo Rate): It becomes cheaper to borrow. People spend more, demand rises, and prices can go up.
This paper asks a simple question: Does hitting the brakes actually slow the car down, and how long does it take?
The Journey of the Study
The author, Tennyson Pangambam, looked at the data from August 2016 to July 2022. This is the specific time period when India officially started using "Inflation Targeting"—a strategy where the RBI promises to keep prices stable within a specific range.
To figure out the relationship between the Repo Rate and Inflation, the author used some high-tech "mathematical telescopes" (econometric tools) to look at the data. Here is what they found, translated into everyday terms:
1. The "One-Month Wait" (The Lag Effect)
The most important finding is that the RBI's brakes don't work instantly. It's like pressing the brake pedal in a heavy truck; the car doesn't stop the exact second you press it.
The study found a one-month lag.
- The Analogy: If the RBI raises the interest rate in February, the effect on prices won't be felt until March.
- The Proof: The math showed that the "brake" (Repo Rate) from one month ago is the one that actually slows down the "speed" (Inflation) today.
2. The One-Way Street (Causality)
The study checked who is driving whom. Does inflation force the RBI to change rates, or does the RBI change rates to control inflation?
- The Finding: It's a one-way street. Changes in the Repo Rate cause changes in Inflation.
- The Metaphor: The RBI is the puppeteer pulling the strings. When the RBI moves the Repo Rate, the Inflation rate follows. The Inflation rate does not pull the Repo Rate around in this specific relationship.
3. The Long-Term Connection (Cointegration)
Even though there is a one-month delay, the study found that the Repo Rate and Inflation are tied together in the long run.
- The Analogy: Imagine two dancers. They might stumble or step out of sync for a moment (the short-term lag), but they are holding hands and will always move back into step with each other eventually. The math proved that these two variables have a stable, long-term relationship.
4. The "Self-Correcting" Mechanism
The study also looked at how fast the economy fixes itself if it gets out of balance.
- The Finding: About 84% of any "mistake" or gap between where prices are and where they should be gets fixed within a single month.
- The Metaphor: If the car drifts off the road, the driver (the economy) corrects the steering wheel very quickly—almost entirely within one month—to get back on track.
The Bottom Line
The paper concludes that the RBI's strategy of using the Repo Rate to control inflation is working.
- It takes about one month for the policy to kick in.
- The RBI is successfully steering the economy.
- When the RBI adjusts the Repo Rate, it effectively pushes the monthly inflation rate in the desired direction.
In short, the study confirms that the RBI's "brakes" are effective, they work with a predictable one-month delay, and they keep the economy's speed (inflation) under control over the long haul.
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