Working Paper
Liu, Laura, and Mikkel Plagborg-Møller. Working Paper. “Full-Information Estimation of Heterogeneous Agent Models Using Macro and Micro Data”. Abstract

We develop a generally applicable full-information inference method for heterogeneous agent models, combining aggregate time series data and repeated cross sections of micro data. To deal with unobserved aggregate state variables that affect cross-sectional distributions, we compute a numerically unbiased estimate of the model-implied likelihood function. Employing the likelihood estimate in a Markov Chain Monte Carlo algorithm, we obtain fully efficient and valid Bayesian inference.

Working paper (December 19, 2018)
Preliminary and incomplete - comments welcome!
Gopinath, Gita, Emine Boz, Camila Casas, Federico J. Díez, Pierre-Olivier Gourinchas, and Mikkel Plagborg-Møller. Working Paper. “Dominant Currency Paradigm”. Abstract

Most trade is invoiced in very few currencies. Yet, standard models assume prices are set in either the producer's or destination's currency. We present instead a 'dominant currency paradigm' with three key features: pricing in a dominant currency, pricing complementarities, and imported input use in production. We test this paradigm using both a newly constructed data set of bilateral price and volume indices for more than 2,500 country pairs that covers 91% of world trade, and very granular firm-product-country data for Colombian exports and imports. In strong support of the paradigm we find that: (1) Non-commodities terms of trade are essentially uncorrelated with exchange rates. (2) The dollar exchange rate quantitatively dominates the bilateral exchange rate in price pass-through and trade elasticity regressions, and this effect is increasing in the share of imports invoiced in dollars. (3) U.S. import volumes are significantly less sensitive to bilateral exchange rates, compared to other countries' imports. (4) A 1% U.S. dollar appreciation against all other currencies predicts a 0.6% decline within a year in the volume of total trade between countries in the rest of the world, controlling for the global business cycle.

Working paper (December 13, 2018) "Global Trade and the Dollar" working paper (April 13, 2018)
Based on merging "Global Trade and the Dollar" with a pre-existing paper called "Dominant Currency Paradigm" by Casas, Diez, Gopinath & Gourinchas.
Plagborg-Møller, Mikkel, and Christian K. Wolf. Working Paper. “Local Projections and VARs Estimate the Same Impulse Responses”. Abstract

We prove that linear local projections and Vector Autoregressions (VARs) estimate the same impulse response functions. This nonparametric result only requires the lag structures in the two specifications to be unrestricted. We discuss several implications: (i) Local projection and VAR estimators should not be thought of as conceptually separate procedures; instead, they belong to a spectrum of dimension reduction techniques that share the same estimand but have different finite-sample bias-variance properties. (ii) VAR-based structural estimation can equivalently be performed using local projections, and vice versa. (iii) Valid structural estimation with an external instrument (also known as a proxy variable) can be carried out by ordering the instrument first in a recursive VAR, even if the shock of interest is noninvertible. (iv) Local projections are not more "robust to non-linearities" than VARs.

Working paper (January 20, 2019)
Plagborg-Møller, Mikkel, and Christian K. Wolf. Working Paper. “Instrumental Variable Identification of Dynamic Variance Decompositions”. Abstract

Macroeconomists often estimate impulse response functions using external instruments (proxy variables) for the shocks of interest. However, existing methods do not answer the key question of how important the shocks are in driving macro aggregates. We provide tools for doing inference on variance decompositions in a general semiparametric moving average model, disciplined only by the availability of external instruments. The share of the variance that can be attributed to a shock is partially identified, albeit with informative bounds. Point identification of most parameters, including historical decompositions, can be achieved under much weaker assumptions than invertibility, a condition imposed in conventional Structural Vector Autoregressive (SVAR) analysis. In fact, external instruments make the invertibility assumption testable. To perform inference, we construct partial identification robust confidence intervals. We illustrate our methods using (i) a structural macro model and (ii) an empirical study of the importance of monetary policy shocks.

Working paper (November 24, 2018) Online appendix (November 24, 2018) Code and replication files (June 13, 2018)
Plagborg-Møller, Mikkel. 2016. “Essays in Macroeconometrics.” Department of Economics, Harvard University. Abstract

This dissertation consists of three independent chapters on econometric methods for macroeconomic analysis. In the first chapter, I propose to estimate structural impulse response functions from macroeconomic time series by doing Bayesian inference on the Structural Vector Moving Average representation of the data. This approach has two advantages over Structural Vector Autoregression analysis: It imposes prior information directly on the impulse responses in a flexible and transparent manner, and it can handle noninvertible impulse response functions. The second chapter, which is coauthored with B. J. Bates, J. H. Stock, and M. W. Watson, considers the estimation of dynamic factor models when there is temporal instability in the factor loadings. We show that the principal components estimator is robust to empirically large amounts of instability. The robustness carries over to regressions based on estimated factors, but not to estimation of the number of factors. In the third chapter, I develop shrinkage methods for smoothing an estimated impulse response function. I propose a data-dependent criterion for selecting the degree of smoothing to optimally trade off bias and variance, and I devise novel shrinkage confidence sets with valid frequentist coverage.

PhD Dissertation (May 12, 2016)
Journal Article
Boz, Emine, Gita Gopinath, and Mikkel Plagborg-Møller. Forthcoming. “Dollar Invoicing and the Heterogeneity of Exchange Rate Pass-Through.” AEA Papers and Proceedings 109. Abstract

We show empirically that the variation across country pairs in exchange rate pass-through and trade elasticity is meaningfully explained by the dollar's dominance as invoicing currency. We use a hierarchical Bayesian approach to directly and flexibly model pass-through heterogeneity conditional on the invoicing currency share. We estimate that the importer's country-level dollar invoicing share explains 15 percent of the overall variance across trading pairs in dollar exchange rate pass-through into bilateral prices.

Working paper (January 14, 2019) Online appendix (January 14, 2019)
This article has not been peer reviewed.
Plagborg-Møller, Mikkel. 2019. “Bayesian Inference on Structural Impulse Response Functions.” Quantitative Economics 10 (1): 145-184. Publisher's Version Abstract

I propose to estimate structural impulse responses from macroeconomic time series by doing Bayesian inference on the Structural Vector Moving Average representation of the data. This approach has two advantages over Structural Vector Autoregressions. First, it imposes prior information directly on the impulse responses in a flexible and transparent manner. Second, it can handle noninvertible impulse response functions, which are often encountered in applications. Rapid simulation of the posterior distribution of the impulse responses is possible using an algorithm that exploits the Whittle likelihood. The impulse responses are partially identified, and I derive the frequentist asymptotics of the Bayesian procedure to show which features of the prior information are updated by the data. The procedure is used to estimate the effects of technological news shocks on the U.S. business cycle.

Working paper (July 4, 2018) Online appendix (July 4, 2018)
Montiel Olea, José Luis, and Mikkel Plagborg-Møller. 2019. “Simultaneous Confidence Bands: Theory, Implementation, and an Application to SVARs.” Journal of Applied Econometrics 34 (1): 1-17. Publisher's Version Abstract

Simultaneous confidence bands are versatile tools for visualizing estimation uncertainty for parameter vectors, such as impulse response functions. In linear models, it is known that that the sup-t confidence band is narrower than commonly used alternatives, for example Bonferroni and projection bands. We show that the same ranking applies asymptotically even in general nonlinear models, such as VARs. Moreover, we provide further justification for the sup-t band by showing that it is the optimal default choice when the researcher does not know the audience's preferences. Complementing existing plug-in and bootstrap implementations, we propose a computationally convenient Bayesian sup-t band with exact finite-sample simultaneous credibility. In an application to SVAR impulse response function estimation, the sup-t band - which has been surprisingly overlooked in this setting - is at least 35% narrower than other off-the-shelf simultaneous bands.

Working paper (August 8, 2018) Supplementary appendix (August 8, 2018)
Mavroeidis, Sophocles, Mikkel Plagborg-Møller, and James H. Stock. 2014. “Empirical Evidence on Inflation Expectations in the New Keynesian Phillips Curve.” Journal of Economic Literature 52 (1): 124-188. Publisher's Version Abstract

We review the main identification strategies and empirical evidence on the role of expectations in the New Keynesian Phillips curve, paying particular attention to the issue of weak identification. Our goal is to provide a clear understanding of the role of expectations that integrates across the different papers and specifications in the literature. We discuss the properties of the various limited-information econometric methods used in the literature and provide explanations of why they produce conflicting results. Using a common dataset and a flexible empirical approach, we find that researchers are faced with substantial specification uncertainty, as different combinations of various a priori reasonable specification choices give rise to a vast set of point estimates. Moreover, given a specification, estimation is subject to considerable sampling uncertainty due to weak identification. We highlight the assumptions that seem to matter most for identification and the configuration of point estimates. We conclude that the literature has reached a limit on how much can be learned about the New Keynesian Phillips curve from aggregate macroeconomic time series. New identification approaches and new datasets are needed to reach an empirical consensus.

Working paper (November 28, 2013)

Online supplement (external link)

Bates, Brandon J., Mikkel Plagborg-Møller, James H. Stock, and Mark W. Watson. 2013. “Consistent factor estimation in dynamic factor models with structural instability.” Journal of Econometrics 177 (2): 289-304. Publisher's Version Abstract

This paper considers the estimation of approximate dynamic factor models when there is temporal instability in the factor loadings. We characterize the type and magnitude of instabilities under which the principal components estimator of the factors is consistent and find that these instabilities can be larger than earlier theoretical calculations suggest. We also discuss implications of our results for the robustness of regressions based on the estimated factors and of estimates of the number of factors in the presence of parameter instability. Simulations calibrated to an empirical application indicate that instability in the factor loadings has a limited impact on estimation of the factor space and diffusion index forecasting, whereas estimation of the number of factors is more substantially affected.

Working paper (December 28, 2012) Replication files (December 3, 2012)
Special issue of Journal of Econometrics in honor of Hashem Pesaran.
Peysakhovich, Alexander, and Mikkel Plagborg-Møller. 2012. “A note on proper scoring rules and risk aversion.” Economics Letters 117 (1): 357-361. Publisher's Version Abstract

When risk averse forecasters are presented with risk neutral proper scoring rules, they report probabilities whose ratios are shaded towards 1. If elicited probabilities are used as inputs to decision-making, naive elicitors may violate first-order stochastic dominance.

Longer working paper (March 9, 2012)
Pedersen, Erik Haller, and Mikkel Plagborg-Møller. 2010. “New Calculation of Danmarks Nationalbank’s Effective Krone-Rate Index.” Danmarks Nationalbank Monetary Review 2nd Quarter: 139-144. Publisher's Version Abstract

Danmarks Nationalbank regularly publishes an index of the development in the strength of the krone, the effective krone-rate index, and an index of the competitiveness of the Danish manufacturing sector, the real effective krone-rate index. Changing trade patterns make it necessary to revise the weights of the currencies in the index from time to time. The 2009 weights are presented below. The most recent revision of the weights is documented in Pedersen (2004).

This article has not been peer reviewed. Danish version