Monetary tightening raises employment concentration
A DNB working paper finds that monetary policy tightenings disproportionately reduce employment at small firms, increasing overall employment concentration. This mechanism significantly impacts the output-inflation trade-off.
Small firms bear the brunt of tightening
A new DNB working paper documents an 'employment concentration channel' of monetary policy.
Empirical evidence from a mixed-frequency BVAR on U.S. data (1983–2018) shows that monetary tightenings disproportionately affect small, high-churn firms.
These firms experience a collapse in entry and an acceleration in exit, leading to a significant destruction of small-firm employment.
In contrast, large incumbent firms remain largely insulated, rarely exiting and showing weak sensitivity to entry conditions.
This mechanism results in a persistent increase in employment concentration, as the share of workers at large firms rises.
The study finds this channel to be quantitatively important in explaining the empirical output-inflation trade-off.
Firm composition shapes policy impact
To rationalize the findings, an estimated structural model with heterogeneous firms, endogenous entry and exit, and equilibrium unemployment is developed.
It successfully replicates the observed rise in employment concentration and asymmetric job flows.
Counterfactual analyses show that size-dependent exit and initial concentration are crucial; altering them mutes the effect and creates an output-inflation trade-off inconsistent with data.
This underscores that firm composition is not neutral for monetary policy, as it shapes how productive capacity contracts and how this translates into price and quantity adjustments.
A new lens on policy transmission
This study provides a crucial new perspective on how monetary policy affects the real economy, moving beyond aggregate effects to firm-level dynamics.
The finding that firm composition influences the output-inflation trade-off is highly relevant for central banks, especially given observed trends in business dynamism.
It suggests that policy effectiveness may be evolving, requiring a more nuanced understanding of market structure.