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Author:Mertens, Thomas M. 

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Monetary policy frameworks and the effective lower bound on interest rates

This paper applies a standard New Keynesian model to analyze the effects of monetary policy in the presence of a low natural rate of interest and a lower bound on interest rates. Under a standard inflation-targeting approach, inflation expectations will become anchored at a level below the inflation target, which in turn exacerbates the deleterious effects of the lower bound on the economy. Two key themes emerge from our analysis. First, the central bank can mitigate this problem of a downward bias in inflation expectations by following an average-inflation targeting framework that aims for ...
Staff Reports , Paper 877

Report
What to expect from the lower bound on interest rates: evidence from derivatives prices

This paper analyzes the effects of the lower bound for interest rates on the distributions of inflation and interest rates. We study a stylized New Keynesian model where the policy instrument is subject to a lower bound to motivate the empirical analysis. Two equilibria emerge: In the “target equilibrium,” policy is unconstrained most or all of the time, whereas in the “liquidity trap equilibrium,” policy is mostly or always constrained. We use options data on future interest rates and inflation to study whether the decrease in the natural real rate of interest leads to forecast ...
Staff Reports , Paper 865

Journal Article
Market Reactions to Tariff Announcements

Financial markets repriced assets across a wide range of sectors following the U.S. trade policy announcement on April 2, 2025. Analysis suggests that market participants interpreted tariffs to have direct effects not only on companies in the sectors involved but also indirect effects on overall demand. Investors expected declines in corporate profits to be persistent both in the United States and abroad. The U.S. dollar depreciated against other safe-haven currencies, which points to investors reallocating their portfolios away from the United States and toward other markets.
FRBSF Economic Letter , Volume 2025 , Issue 23 , Pages 6

Working Paper
Tying Down the Anchor: Monetary Policy Rules and the Lower Bound on Interest Rates

This paper uses a standard New Keynesian model to analyze the effects and implementation of various monetary policy frameworks in the presence of a low natural rate of interest and a lower bound on interest rates. Under a standard inflation-targeting approach, inflation expectations will be anchored at a level below the inflation target, which in turn exacerbates the deleterious effects of the lower bound on the economy. Two key themes emerge from our analysis. First, the central bank can eliminate this problem of a downward bias in inflation expectations by following an average-inflation ...
Working Paper Series , Paper 2019-14

Journal Article
Information in the Yield Curve about Future Recessions

The ability of the Treasury yield curve to predict future recessions has recently received a great deal of public attention. An inversion of the yield curve?when short-term interest rates are higher than long-term rates?has been a reliable predictor of recessions. The difference between ten-year and three-month Treasury rates is the most useful term spread for forecasting recessions?without any adjustment for an estimate of the underlying term premium. However, such correlations in the data do not identify cause and effect, which complicates their interpretation.
FRBSF Economic Letter

Working Paper
Macroeconomic Drivers and the Pricing of Uncertainty, Inflation, and Bonds

The correlation between uncertainty shocks, as measured by changes in the VIX, and changes in breakeven inflation rates declined and turned negative after the Great Recession. This estimated time-varying correlation is shown to be consistent with the predictions of a standard New Keynesian model with a lower bound on interest rates and a trend decline in the natural rate of interest. In one equilibrium of the model, higher uncertainty raises the probability of large shocks that leave the central bank constrained by the lower bound and unable to offset negative shocks. Resulting inflation ...
Working Paper Series , Paper 2022-06

Journal Article
Effects of Asset Valuations on U.S. Wealth Distribution

Net household wealth is highly unequal across U.S. households, and the types of assets people hold tend to change according to their position along the distribution of wealth. The pattern of household portfolios shows that the top 1% of households hold most of their wealth in stocks, while home values are most important for the wealth of the bottom half of the distribution. Higher growth in equity values relative to real estate values therefore tends to widen the wealth distribution, as experienced during the coronavirus pandemic.
FRBSF Economic Letter , Volume 2021 , Issue 24 , Pages 01-06

Report
Tying down the anchor: monetary policy rules and the lower bound on interest rates

This paper uses a standard New Keynesian model to analyze the effects and implementation of various monetary policy frameworks in the presence of a low natural rate of interest and a lower bound on interest rates. Under a standard inflation-targeting approach, inflation expectations will be anchored at a level below the inflation target, which in turn exacerbates the deleterious effects of the lower bound on the economy. Two key themes emerge from our analysis. First, the central bank can eliminate this problem of a downward bias in inflation expectations by following an average-inflation ...
Staff Reports , Paper 887

Working Paper
The Optimal Supply of Central Bank Reserves under Uncertainty

This paper provides an analytically tractable theoretical framework to study the optimal supply of central bank reserves when the demand for reserves is uncertain and nonlinear. We fully characterize the optimal supply of central bank reserves and associated market equilibrium. We find that the optimal supply of reserves under uncertainty is greater than that absent uncertainty. With a sufficient degree of uncertainty, it is optimal to supply a level of reserves that is abundant (on the flat portion of the demand curve) absent shocks. The optimal mean spread between the market interest rate ...
Working Paper Series , Paper 2023-34

Working Paper
The Social Cost of Near-Rational Investment

We show that the stock market may fail to aggregate information even if it appears to be efficient, and that the resulting decrease in the information content of prices may drastically reduce welfare. We solve a macroeconomic model in which information about fundamentals is dispersed and households make small, correlated errors when forming expectations about future productivity. As information aggregates in the market, these errors amplify and crowd out the information content of stock prices. When prices reflect less information, the conditional variance of stock returns rises, causing an ...
Working Paper Series , Paper 2016-16

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