Why RBI isn't targeting Rupee's price band, but inflation — the 'impossible trilemma' explained

In aboriginal December 2025, the Indian rupee reached a cardinal milestone erstwhile it surpassed Rs 90 per dollar for the archetypal time. The rupee had been falling steadily passim the year, arsenic overseas investors sold disconnected Indian stocks and US tariffs made Indian exports little competitive.However, connected December 5, 2025, Reserve Bank of India Governor Sanjay Malhotra delivered a wide message"We don't people immoderate terms levels (of rupee) oregon immoderate bands. We let the markets to find the prices."On the rupee's slide, Chief Economic Adviser V. Anantha Nageswaran told reporters that the authorities wasn't "losing sleep" implicit the currency's decline. The falling rupee, helium insisted, was "not affecting ostentation oregon exports" and should "improve adjacent twelvemonth (2026)."

These weren't throwaway lines. They reflected a cardinal economical model - the intolerable trilemma - that constrains each modern cardinal slope and explains wherefore India prioritizes ostentation power implicit defending arbitrary currency levels. The rupee's astir 6% depreciation successful 2025 wasn't a argumentation failure. It was the deliberate terms of maintaining monetary independence.

The Impossible Trilemma: India's two-out-of-three choice

The intolerable trilemma, explained by economists Robert Mundell and Marcus Fleming successful the aboriginal 1960s, presents 1 of the astir cardinal constraints successful planetary economics.

It states that it is intolerable to person each 3 of the pursuing astatine the aforesaid time:

As Paul Krugman famously summarized: "The constituent is that you can't person it all: A state indispensable prime 2 retired of three."

Understanding each country of the trilemma

Free Capital Flows: This means allowing capital—both overseas and domestic—to determination successful and retired of a state without restrictions. Investors tin bargain Indian bonds oregon stocks, and Indians tin put overseas without facing superior controls.

The payment is entree to planetary superior markets, which tin money maturation and development. The hazard is volatility—hot wealth tin unreserved successful during bully times and fly during crises.Independent Monetary Policy: This is the cardinal bank's quality to acceptable involvement rates based purely connected home economical conditions—inflation, growth, unemployment—without worrying astir outer pressures. If ostentation is rising domestically, the RBI tin rise rates.

If maturation is slowing, it tin chopped rates. This independency is important for managing the home economy.Fixed Exchange Rate: This means committing to support the currency astatine a predetermined level against different currency (usually the US dollar) oregon wrong a constrictive band. The payment is predictability for commercialized and investment. The outgo is the nonaccomplishment of flexibility to respond to economical shocks.

The mechanism: Why you can't person each three

If a state wants to support a fixed speech complaint portion allowing superior to travel freely crossed its borders, it indispensable sacrifice power implicit its monetary policy. Here's why:Suppose India tried to hole the rupee astatine Rs 80 per dollar portion keeping borders unfastened to superior flows.

If the RBI accrued involvement rates to combat home inflation, higher returns would pull overseas capital, creating request for rupees and pushing the speech complaint beneath Rs 80—say, to Rs 78. To support the Rs 80 peg, the RBI would person to merchantability rupees and bargain dollars, expanding wealth proviso and negating the involvement complaint hike's anti-inflationary effect.Conversely, if the RBI chopped rates to stimulate growth, superior would fly to higher-yielding assets abroad, weakening the rupee beyond Rs 80– say, to Rs 82.

To support the peg, the RBI would person to merchantability dollars and bargain rupees, reducing wealth proviso and negating the complaint cut's growth-boosting effect.In some cases, the effort to support a fixed speech complaint forces the cardinal slope to intervene successful ways that undo its monetary argumentation actions. The involvement complaint becomes a instrumentality for managing the speech rate, not the home economy.As Ranen Banerjee, Partner and Leader, Economic Advisory Services & Government Sector Leader astatine PwC India, told TOI "The trilemma refers to making a monetary argumentation prime betwixt archetypal having fixed oregon floating involvement rates, 2nd escaped oregon restricted superior mobility and 3rd having an autarkic capableness to acceptable involvement rates.

A monetary argumentation of a state has to marque a prime of immoderate 2 of these and cannot marque a prime to person each three.

"

India's choice: Monetary Independence and Capital Mobility

India's prime has been wide since the 1990s economical liberalization: prioritize monetary argumentation independency and superior relationship openness, accepting speech complaint flexibility arsenic the indispensable trade-off."In the lawsuit of India, we person made a prime of having independency successful mounting involvement rates and having escaped superior mobility," says Ranen Banerjee.

"Thus, we volition not person the quality to power speech rates and it has to beryllium floating. If we effort to power the speech rate, we volition person to marque a compromise connected either our quality to acceptable involvement rates oregon bring successful superior travel controls. Hence successful the existent argumentation choices made successful the monetary policy, the rupee volition find its ain level with the Reserve Bank interventions being lone for absorption of volatility arsenic stated successful its policy.

"In 2016 a flexible inflation-targeting model was adopted, which made terms stability—targeting user terms ostentation astatine 4% with a tolerance set of ±2 percent points—the RBI's superior statutory objective.

India's currency regime: Managed interval successful practice

While India officially follows a "market-determined" speech complaint system, successful signifier it operates what economists telephone a "managed float" regime. The RBI doesn't people a circumstantial speech complaint level, but it does intervene to negociate excessive volatility.

How RBI interventions work

The RBI's forex interventions typically hap through:

The cardinal distinction: These interventions purpose to creaseless volatility, not support a circumstantial rate. As Governor Malhotra clarified, "We don't people immoderate terms levels oregon immoderate bands."

The reserves buffer

India's overseas speech reserves—currently astir $686.8 cardinal (as of January 2, 2025)—provide the ammunition for these interventions. However, utilizing reserves comes with costs.

Each dollar merchantability drains reserves, and assertive defence tin deplete this buffer, leaving the state susceptible during a genuine crisis.Sachchidanand Shukla, Group Chief Economist astatine Larsen & Toubro, points to different constraint: "RBI's ample nett FX abbreviated guardant positions enactment arsenic a resistance connected the INR. While the RBI tin rotation implicit connected maturity dates, it risks making it cheaper for speculators to money long-USD positions and giving transportation would adversely interaction durable liquidity, which could interaction monetary transmission and measurement connected the FX reserves."

Why Inflation takes precedence implicit speech rate

India's inflation-targeting framework, adopted successful 2016, mandates the RBI to prioritize terms stability. The model defines this arsenic targeting Consumer Price Index (CPI) ostentation astatine 4% with a tolerance set of 2-6%, according to Inflation targeting model 2016.

In 2025, ostentation has remained extraordinarily low, dropping beneath adjacent the 2% little tolerance set for 3 consecutive months (September-November).This occurrence wasn't accidental. It required accordant absorption connected home terms stability, sometimes astatine the disbursal of currency stability. Between May 2022 and February 2023, the RBI raised the repo complaint by 250 ground points (from 4% to 6.5%) to combat post-pandemic inflation, adjacent arsenic this widened involvement complaint differentials with different economies and enactment upward unit connected superior outflows.

As Ranen Banerjee notes, maintaining this independency is crucial: "Hence successful the existent argumentation choices made successful the monetary policy, the rupee volition find its ain level with the Reserve Bank interventions being lone for absorption of volatility arsenic stated successful its policy."

When the trilemma breaks: Historical lessons

History is evident with crises wherever nations tried to "have it all" and failed spectacularly:

1992 UK (Black Wednesday)

The UK tried to support the pound's peg to the Deutsche Mark wrong the European Exchange Rate Mechanism portion allowing superior flows. When economical conditions diverged—Germany needed precocious rates to combat reunification ostentation portion the UK needed little rates to combat recession—the peg became unsustainable.Speculators, astir famously George Soros, stake against the peg.

On September 16, 1992, the Bank of England spent billions defending the lb and raised involvement rates from 10% to 15% successful a azygous time - but since it failed the implementation ne'er happened. The UK was forced to exit the mechanism, devalue the pound, and wantonness the peg. Soros reportedly made implicit $1 billion, according to Investopedia.The lesson: No magnitude of reserves tin support an overvalued peg against determined marketplace forces erstwhile fundamentals don't align.

1997 Asian Financial Crisis

Thailand, Indonesia, and South Korea attempted to support currency pegs with unfastened superior markets portion their economies overheated. When the Thai baht came nether speculative onslaught successful July 1997, Thailand spent its reserves defending the peg earlier yet floating.The baht collapsed 50% wrong months. The situation dispersed to Indonesia (rupiah fell 80%), Malaysia, and South Korea. The IMF had to put bailout packages.

Millions mislaid jobs, incomes, and savings.The lesson: Fixed pegs with unfastened superior accounts go untenable erstwhile underlying economical fundamentals—current relationship deficits, plus bubbles, backstage assemblage debt—turn unfavorable.

2001 Argentina

Argentina maintained a 1-to-1 dollar peg for a decennary portion allowing comparatively escaped superior flows. When the system slipped into recession successful 1998-1999 and superior began fleeing, Argentina should person either floated the peso, imposed superior controls, oregon implemented achy deflation to reconstruct competitiveness.It did nary of these decisively. Reserves drained, assurance collapsed, and successful December 2001, Argentina froze slope deposits, defaulted connected $95 cardinal successful sovereign debt, and abandoned the peg, according to Cato Institute. The peso yet fell to 4-per-dollar. GDP contracted 20%, unemployment deed 25%, and poorness soared. . In 2001, the debt-to-GDP ratio was 55 percent, though the fig accrued to 150 percent aft the depreciation since astir of the indebtedness was denominated successful overseas currency, according to a Brooking study.

The lesson: Trying to support each 3 corners of the trilemma during a situation lone delays and amplifies the eventual collapse.

The Rupee successful 2025

The rupee's show needs context. While it depreciated astir 6% successful 2025—becoming 1 of Asia's weaker currencies—this follows a twelvemonth of comparative stability.

Why the Rupee weakened successful 2025Multiple factors converged to unit the rupee successful 2025:

1. Monetary argumentation divergence

At the different extremity of the spectrum, India has already seen complaint cuts on with different easing measures, which person importantly narrowed its involvement complaint differential with determination peers and enactment downward unit connected the rupee, an investigation by Haver Analytics said "This has importantly reduced India's involvement complaint differential with determination peers and placed downward unit connected the Indian rupee."

Meanwhile, the US Federal Reserve kept rates elevated for longer than expected, widening the US-India complaint differential.

2. Foreign portfolio outflows

Foreign organization investors turned nett sellers of Indian equities and indebtedness successful 2025. The outflows were driven by:

3. Current relationship pressures

India's existent relationship deficit—though inactive humble astatine 1.1% of GDP (December 2025)—reflects ongoing import demand, peculiarly for oil. As Sachchidanand Shukla notes: "The lack of affirmative newsflow connected the India-US commercialized woody and expectations of a larger BOP [balance of payments] shortage proceed to wounded INR.

4. RBI intervention

"This backdrop forces RBI to prioritize monetary independency and unfastened superior relationship arsenic inflows, particularly FDI are important, and hence it allows INR to beryllium flexible/gyrate," explains Sachchidanand Shukla. "Also, an assertive defence of the INR astatine the existent juncture could beryllium futile."

The strategical rationale: Why flexibility matters

Allowing the rupee to depreciate, alternatively than spending reserves to support arbitrary levels, serves aggregate strategical purposes:

1. Preserving Firepower

"An assertive defence of the INR astatine the existent juncture could beryllium futile," argues Sachchidanand Shukla.

"Instead, two-way question successful INR tin beryllium utilized to sorb immoderate of the planetary pressures, sphere FX buffers and let market-driven adjustments that boost export competitiveness successful a volatile world."India's forex reserves, portion important astatine $696.6 (dec 26, 2025) billion, are finite. The Asian Financial Crisis showed that reserves tin beryllium depleted rapidly erstwhile defending unsustainable levels. By allowing gradual depreciation, the RBI preserves reserves for genuine emergencies.

2. Export Competitiveness

A weaker rupee makes Indian exports cheaper successful dollar terms, perchance offsetting immoderate interaction of US tariffs. With the REER having peaked astatine 108.14—indicating important overvaluation—allowing depreciation helps reconstruct competitiveness.Chief Economic Adviser Nageswaran emphasized this point, noting the falling rupee was "not affecting ostentation oregon exports" negatively. In fact, a much competitory speech complaint could enactment export-oriented sectors similar IT services, textiles, and pharmaceuticals.

3. Maintaining monetary autonomy

Most crucially, allowing currency flexibility preserves the RBI's quality to acceptable involvement rates based connected home needs. With ostentation falling to historical lows (0.25% successful October 2025), the RBI had justification to chopped rates to enactment growth. Attempting to support the rupee astatine a fixed level would person required keeping rates precocious contempt debased inflation—sacrificing home economical goals for an arbitrary currency target.

4. Two-way question deters speculation

"Two-way question successful INR tin beryllium utilized to sorb immoderate of the planetary pressures," notes Sachchidanand Shukla. When the rupee lone weakens (one-way movement), it becomes a profitable one-way stake for speculators. If they cognize the RBI volition forestall strengthening but let weakening, they tin abbreviated the rupee risk-free.Two-way movement—allowing some appreciation and depreciation—makes speculation riskier and much expensive, people deterring immoderate of it.

The roadworthy ahead: What this means for Rupee

Looking ahead, the rupee's trajectory volition beryllium connected factors immoderate of which are extracurricular the RBI's control:External Factors:

Domestic Factors:

What won't alteration is the framework. India volition proceed prioritizing monetary independency and superior openness, accepting speech complaint flexibility arsenic the price. The RBI volition intervene to negociate volatility, not support circumstantial levels.As Ranen Banerjee summarizes: "In the existent argumentation choices made successful the monetary policy, the rupee volition find its ain level with the Reserve Bank interventions being lone for absorption of volatility arsenic stated successful its policy."The intolerable trilemma isn't a theoretical abstraction. It's a applicable constraint that shapes decisions astir involvement rates, superior flows, and speech rates. Understanding it is indispensable to knowing wherefore the RBI responds to currency movements the mode it does—and wherefore allowing the rupee to find its level, alternatively than defending arbitrary bands, is not argumentation nonaccomplishment but argumentation by design.