The Dynamics of NEER and REER: India's Rupee Valuation, Trade Competitiveness, and Economic Implications.....

The nominal effective exchange rate, or NEER, and the real effective exchange rate, or REER, serve as vital barometers of a nation's currency strength and external competitiveness in the global marketplace. For India, a major emerging economy with significant trade linkages across continents, these indices provide policymakers, exporters, and importers with clear signals about whether the rupee is fairly valued relative to trading partners. NEER captures the weighted average movement of the rupee against a basket of foreign currencies based purely on nominal bilateral exchange rates, while REER refines this picture by incorporating relative price levels, essentially adjusting for inflation differentials. Understanding their interplay reveals not only the rupee's current standing but also its potential effects on exports, imports, and overall economic balance.

In the introduction to these concepts, NEER represents a geometric weighted average of the rupee's bilateral nominal exchange rates against currencies of key trading partners, with weights typically derived from their shares in India's trade basket. It reflects pure currency movements without inflation adjustments and is often expressed as an index with a base year set to 100 for easy comparison. A rise in the NEER index indicates nominal appreciation of the rupee, making foreign goods cheaper for Indian buyers and Indian goods more expensive abroad. REER builds directly upon NEER by factoring in domestic and foreign price changes, offering a measure of real competitiveness. The standard formula used by the Reserve Bank of India for these indices employs a geometric mean across the currency basket. Mathematically, the NEER is calculated as the product over trading partners of the indexed bilateral rates raised to their respective trade weights, while REER extends this to include the ratio of price indices.

This formula allows analysts to derive insights into NEER by rearranging terms when REER and relative prices are known, though in practice published indices from the central bank already embody these computations using actual bilateral data and inflation figures.The analysis of these rates for India highlights their role in assessing whether the rupee is overvalued or undervalued. When REER exceeds the base-year benchmark of 100, the rupee is considered overvalued in real terms, eroding export competitiveness as Indian goods become relatively costlier after inflation adjustments. Conversely, a REER below 100 signals undervaluation, enhancing competitiveness by making exports cheaper and imports dearer in real terms. NEER, being unadjusted, often moves in tandem but can diverge sharply during periods of divergent inflation. For India, persistent high domestic inflation compared to trading partners has historically pushed REER upward unless offset by nominal depreciation. Recent trends show a deliberate softening of the rupee through market forces and policy vigilance, allowing NEER to decline while REER moderates toward or below equilibrium. This dynamic supports export growth amid global uncertainties but risks imported inflation if prolonged. By using the REER formula with actual data, one can back-calculate implied NEER movements or verify competitiveness: for instance, if relative prices rise faster domestically, NEER must depreciate sufficiently to keep REER stable, preserving trade balance. India's approach balances these to avoid sharp volatility, with the central bank intervening judiciously in forex markets to maintain orderly conditions.

Turning to the data, recent figures from the Reserve Bank of India for the 36-currency trade-weighted basket, based on 2015-16 as the reference year set at 100, illustrate a clear trajectory of nominal weakening accompanied by real moderation. In the financial year 2024-25, the NEER averaged around 91.01 while REER stood at 105.24, indicating lingering real appreciation from earlier periods. Entering 2025-26, the indices trended downward month by month. April saw NEER at 88.99 and REER at 100.11; by May, NEER eased to 88.35 with REER climbing slightly to 100.37. June recorded NEER at 86.92 and REER at 99.70, followed by July's NEER of 86.48 and REER of 100.02. August brought further decline to NEER 85.39 and REER 98.76. September marked a notable softening with NEER at 84.53 and REER dipping to 97.38. October held steady at NEER 84.58 and REER 97.46, while November closed with NEER at 84.35 and REER at 97.51. These values, derived through the REER formula applied to actual bilateral exchange rates and CPI differentials across 36 partners, confirm that the rupee has experienced nominal depreciation alongside a shift into mild undervaluation territory. Complementary broad-based indices from international sources, calibrated to different bases such as 2020 equals 100, echo this pattern with readings falling into the low 90s by early 2026, reinforcing the assessment that India's currency is currently undervalued. This position stems from a combination of controlled domestic inflation, global dollar strength, and policy measures that permitted gradual adjustment rather than abrupt shifts.

The accompanying graph vividly captures these monthly movements for 2025, plotting NEER and REER side by side on dual axes to highlight their correlation and divergence.

As shown, NEER exhibits a steady downward slope reflective of nominal weakening, while REER hovers near and then slips below the 100 threshold, underscoring the real undervaluation emerging in the latter half of the year. Such visual representation aids in grasping how inflation adjustments temper nominal trends, with the REER line revealing periods where relative price stability prevented deeper real appreciation despite currency pressures.

In conclusion, the discussion of NEER and REER underscores their centrality to India's external sector management, with the rupee currently positioned as mildly undervalued based on the latest 36-currency indices hovering around 97 to 98 for REER against the 2015-16 base. This valuation boosts export competitiveness, encouraging shipments of goods and services while curbing non-essential imports, thereby supporting the current account and foreign exchange reserves. If India's REER were to return precisely to 100, the rupee would achieve neutral real valuation, eliminating distortions from over- or undervaluation. Exports would face normalized pricing without the artificial edge of undervaluation, potentially moderating growth in sectors like information technology, pharmaceuticals, and textiles unless offset by productivity gains or demand surges. Imports, meanwhile, would become relatively cheaper in real terms, easing cost pressures on oil, capital goods, and intermediates but risking wider trade deficits if domestic demand remains robust. Overall, a REER at 100 would signal equilibrium competitiveness, fostering sustainable trade flows, reduced intervention needs, and greater macroeconomic stability for India in an interconnected world. Policymakers would then focus on structural reforms rather than exchange-rate management, ensuring long-term growth without the short-term trade-offs of persistent undervaluation or the competitiveness losses of overvaluation. This balanced state remains an aspirational benchmark, guiding India's journey toward resilient global integration.