Drivers of Link Formation in Production Networks
Joint with Lajos Tamás Szabó (Central Bank of Hungary)
What makes a supplier more attractive than its competitors? Which firms are better at holding on to their buyers or suppliers? Such questions determine the shape of the production network of an economy by driving the formation and separation of input-output links. This paper aims to fill a gap in the literature by providing novel descriptive facts about the drivers of link formation using firm-to-firm transaction data from Hungary between 2014 and 2022. We compare firms engaging in link formation and separation to similar firms not involved in such linking decisions. We find that relatively better-performing (profitable, productive, faster growing) firms are more successful in attracting new and keeping existing buyers and suppliers. Contracting a new buyer is preceded by a surge in investments and new hires, suggesting a well-prepared decision. Firms losing a buyer crank up hiring (sacrificing efficiency) in the last year before they lose their buyer. The evolution of the production network is driven by firm growth, productivity, and efficiency, enhancing aggregate productivity and network concentration.
Speed of Propagation in Production Networks
(Earlier versions available at SSRN: https://ssrn.com/abstract=4392276 or http://dx.doi.org/10.2139/ssrn.4392276 )
The Dot-com bubble, the Global Financial Crisis, and the post-COVID inflation were heavily influenced if not entirely triggered by localized sector-specific shocks, such as a financial market collapse, or the supply disruptions of important commodities. These aggregate events eventually unfolded as the triggering shocks' effects propagated through production networks. This paper aims to quantify the propagation speed by developing a novel econometric method. Estimations are carried out on an annual sample of 66 US industries between 1998 and 2020. The speed of propagation is identified from the propagation of industry TFP shocks within the production network into industry output and prices. Results show that the propagation time – the time shocks need to get transmitted between industries – was between 7 to 8 months on average and it accelerated after the GFC. These results provide evidence for dynamic shock propagation, which production network models have mostly overlooked.
The Effect of Distancing Policies on the Reproduction Number of Covid-19
Corvinus Economics Working Papers, 2023/01
Distancing policies became the primary preventive interventions during the covid-19 pandemic. This paper estimates the effect of such interventions on the effective reproduction number (R) of this virus on a daily panel of 109 countries. The main contribution of this paper is the separation of policy compliant and voluntary distancing effects. I identify the policy compliant component of distancing behavior as rapid changes in social activity immediately after an intervention. This allows me to isolate the voluntary component as residual changes in activity. I use this voluntary component as a control in the main estimation of distancing policy effects on R. I distinguish (i) place restrictions: restricting destinations, and (ii) mobility restrictions: regulations on inland movements. I find strong and permanent effects for both types of restrictions. Place restrictions reduce R by 29 percent, mobility restrictions by 61 percent on average. Place and mobility restrictions, and voluntary distancing contributed 21, 44 and 14 percentage points to the global decline in R in the first wave.
Income Taxation, Transfers and Labour Supply at the Extensive Margin.
Joint with Péter Benczúr, Gábor Kátay and Áron Kiss.
Banque de France Working paper series 487; 2014. p. 1-27. JRC89930 [BibTeX]
This paper estimates the effect of income taxation and transfers on labour supply at the extensive margin, i.e., the labour force participation. We extend existing structural form methodologies by considering the effect of both taxes and transfers. Non-labour income contains the (hypothetical) transfer amount someone gets when out of work, while the wage is replaced by the difference between net wages and the amount of lost transfers due to taking up a job (gains to work). To incorporate these components of the budget set, we employ a detailed tax-benefit model. Using data from the Hungarian Household Budget Survey (HKF), we find that participation probabilities are strongly influenced by transfers and the gains to work, particularly for low-skill groups and the elderly. Moreover, the same change in the net wage leads to a much larger change in the gains to work for low earners, making them even more responsive to wages and taxation. Overall, we find that a single equation can capture a large heterogeneity of individual responsiveness to taxes and transfers. Our parametric estimates can be readily utilized in welfare evaluations, or microsimulation analyses of tax and transfer reforms.
Affective Polarization and Naive Realism
Subjective Models and Naive Realism
joint with Miklós Pintér