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Long-Run Inflation Expectations, Bounded Rationality, and Inflation Uncertainty

Arnab Biswas and Chetan Subramanian
2026
Working Paper No
729
Body

This paper studies the formation and anchoring of long-run inflation expectations under bounded rationality and adaptive learning. The empirical analysis applies this framework to India, which provides a useful setting given its recent transition to a formal inflation-targeting regime. Motivated by the persistence of elevated termpremia in India’s sovereign bond market, we develop and estimate a New Keynesian model in which agents update beliefs about long-run inflation in response to short-horizon forecast errors, implying that expectations may remain imperfectly anchored even under an explicit inflationtargeting regime. The model is estimated using inflation data and survey-based short-run inflation expectations from India, allowing us to recover quarterly movements in ten-year-ahead inflation expectations. We find that the introduction of inflation targeting lowered the level of long-run inflation expectations and moved them closer to the policy target. However, long-run beliefs remain sensitive to short-run inflation surprises, consistent with adaptive learning and incomplete anchoring. This persistent belief updating generates long-horizon inflation uncertainty, which is priced into nominal bond yields and contributes to elevated termpremia at longer maturities. Counterfactual simulations show that fully anchored expectations would substantially reduce long-horizon inflation uncertainty and lower long-maturity term premia by around 120 basis points. The results highlight how bounded rationality in expectation formation can sustain inflation risk and termpremia despite improvements in monetary policy credibility.

Key words
Inflation Expectations, Bounded Rationality, Adaptive Learning, Bond TermPremium
WP No. 729.pdf (1.41 MB)

Long-Run Inflation Expectations, Bounded Rationality, and Inflation Uncertainty

Author(s) Name: Arnab Biswas and Chetan Subramanian, 2026
Working Paper No : 729
Abstract:

This paper studies the formation and anchoring of long-run inflation expectations under bounded rationality and adaptive learning. The empirical analysis applies this framework to India, which provides a useful setting given its recent transition to a formal inflation-targeting regime. Motivated by the persistence of elevated termpremia in India’s sovereign bond market, we develop and estimate a New Keynesian model in which agents update beliefs about long-run inflation in response to short-horizon forecast errors, implying that expectations may remain imperfectly anchored even under an explicit inflationtargeting regime. The model is estimated using inflation data and survey-based short-run inflation expectations from India, allowing us to recover quarterly movements in ten-year-ahead inflation expectations. We find that the introduction of inflation targeting lowered the level of long-run inflation expectations and moved them closer to the policy target. However, long-run beliefs remain sensitive to short-run inflation surprises, consistent with adaptive learning and incomplete anchoring. This persistent belief updating generates long-horizon inflation uncertainty, which is priced into nominal bond yields and contributes to elevated termpremia at longer maturities. Counterfactual simulations show that fully anchored expectations would substantially reduce long-horizon inflation uncertainty and lower long-maturity term premia by around 120 basis points. The results highlight how bounded rationality in expectation formation can sustain inflation risk and termpremia despite improvements in monetary policy credibility.

Keywords: Inflation Expectations, Bounded Rationality, Adaptive Learning, Bond TermPremium
WP No. 729.pdf (1.41 MB)