Lukas Hack

Welcome!

I am a Post-Doctoral Researcher at ETH Zürich. I received a doctoral degree from the University of Mannheim in 2024. My main research fields are macroeconomics, monetary economics and public economics.

Curriculum Vitae

News and Upcoming Talks

Freshly updated papers: The Systematic Origins of Monetary Policy Shocks and Understanding Firm Dynamics with Daily Data

Next talks: ifo Center for Macroeconomics and Surveys (Munich, March 5), 32nd Symposium of the SNDE (San Antonio, March 21/22); I will also visit UT Austin (March 24-28)

Media coverage: FAZ article (in German) about my research on bracket creep

Working Papers:

Identification of Systematic Monetary Policy [abstract]
(with Klodiana Istrefi and Matthias Meier, December 2023)
Review of Economic Studies, revise and resubmit

Abstract
We propose a novel identification design to estimate the causal effects of systematic monetary policy on the propagation of macroeconomic shocks. The design combines (i)~a time-varying measure of systematic monetary policy based on the historical composition of hawks and doves in the Federal Open Market Committee (FOMC) with (ii) an instrument that leverages the mechanical FOMC rotation of voting rights. We apply our design to study the effects of government spending shocks. We find fiscal multipliers between two and three when the FOMC is dovish and below zero when it is hawkish. Narrative evidence from historical FOMC records corroborates our findings.

Abstract

We propose a novel identification design to estimate the causal effects of systematic monetary policy on the propagation of macroeconomic shocks. The design combines (i)~a time-varying measure of systematic monetary policy based on the historical composition of hawks and doves in the Federal Open Market Committee (FOMC) with (ii) an instrument that leverages the mechanical FOMC rotation of voting rights. We apply our design to study the effects of government spending shocks. We find fiscal multipliers between two and three when the FOMC is dovish and below zero when it is hawkish. Narrative evidence from historical FOMC records corroborates our findings.

[CEPR DP] [ECB WP] [Ungated] [Vox EU] [ECB Research Bulletin] [SUERF Policy Brief] [BibTex]

The Systematic Origins of Monetary Policy Shocks [abstract]
(with Klodiana Istrefi and Matthias Meier, February 2025)

Abstract
Conventional strategies to identify monetary policy shocks rest on the implicit assumption that systematic monetary policy is time-invariant. In an environment with time-varying systematic monetary policy, we formally show that these strategies yield shocks that are contaminated, leading to bias in estimated impulse responses. In line with our theoretical results, we empirically show that conventional monetary policy shocks are predictable by measured fluctuations in systematic monetary policy. We propose new shocks that are purged of this predictability. Our preferred new shocks show that U.S.~monetary policy affects inflation and output more strongly and faster compared to the corresponding conventional shocks.

Abstract

Conventional strategies to identify monetary policy shocks rest on the implicit assumption that systematic monetary policy is time-invariant. In an environment with time-varying systematic monetary policy, we formally show that these strategies yield shocks that are contaminated, leading to bias in estimated impulse responses. In line with our theoretical results, we empirically show that conventional monetary policy shocks are predictable by measured fluctuations in systematic monetary policy. We propose new shocks that are purged of this predictability. Our preferred new shocks show that U.S.~monetary policy affects inflation and output more strongly and faster compared to the corresponding conventional shocks.

[CEPR DP] [Ungated] [BibTex]

Understanding Firm Dynamics with Daily Data [abstract]
(with Davud Rostam-Afschar, January 2025)

Abstract
How do firms’ plans and expectations respond to macroeconomic shocks? We run a daily survey of German firms over the past three years. We randomize daily invitations, delivering a stable composition of firms. This allows constructing daily time series and estimating dynamic aggregate causal effects. These estimates capture firms’ responsiveness conditional on the recent economic environment, making them informative for policymakers. We examine oil supply, monetary policy, and forward guidance shocks, finding that firms’ plans, especially price-setting plans, respond within days to oil supply and monetary policy shocks but not to forward guidance. Finally, we investigate firm heterogeneity and expectations.

Abstract

How do firms’ plans and expectations respond to macroeconomic shocks? We run a daily survey of German firms over the past three years. We randomize daily invitations, delivering a stable composition of firms. This allows constructing daily time series and estimating dynamic aggregate causal effects. These estimates capture firms’ responsiveness conditional on the recent economic environment, making them informative for policymakers. We examine oil supply, monetary policy, and forward guidance shocks, finding that firms’ plans, especially price-setting plans, respond within days to oil supply and monetary policy shocks but not to forward guidance. Finally, we investigate firm heterogeneity and expectations.

[Ungated] [CRC DP] [SSRN] [Online Supplement] [BibTex] [Daily Business Database]

Work in progress:

Progressive Income Taxation and Inflation: The Macroeconomic Effects of Bracket Creep [abstract]

Abstract
Under nominal progressive taxation, inflation drives up tax rates if the schedule is not adjusted, leading to bracket creep. To isolate bracket creep from other sources of tax rate changes, I propose a non-parametric decomposition of changes in tax rates. Applying the decomposition to German administrative tax records, I find sizeable bracket creep episodes. While the overall importance of bracket creep has decreased over time due to institutional changes, the post-Covid inflation surge led to a resurgence. I characterize how bracket creep affects labor supply decisions in a partial equilibrium framework. Further, I estimate a theory-consistent measure of bracket creep, the indexation gap, which is used to discipline a New Keynesian model with incomplete markets. The model predicts that a given reduction in inflation via a monetary contraction leads to less output costs in an economy with bracket creep.

Abstract

Under nominal progressive taxation, inflation drives up tax rates if the schedule is not adjusted, leading to bracket creep. To isolate bracket creep from other sources of tax rate changes, I propose a non-parametric decomposition of changes in tax rates. Applying the decomposition to German administrative tax records, I find sizeable bracket creep episodes. While the overall importance of bracket creep has decreased over time due to institutional changes, the post-Covid inflation surge led to a resurgence. I characterize how bracket creep affects labor supply decisions in a partial equilibrium framework. Further, I estimate a theory-consistent measure of bracket creep, the indexation gap, which is used to discipline a New Keynesian model with incomplete markets. The model predicts that a given reduction in inflation via a monetary contraction leads to less output costs in an economy with bracket creep.

[FAZ Media Coverage (German)] [Reinhard Selten Award]

Transmission of Monetary Policy in a Currency Area with Heterogeneous Households
(with Hannes Twieling)

Abstract
working paper coming soon