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simonmargolin search this site embedded files skip to main content skip to navigation simonmargolin simon margolin i am an assistant professor at the university of california santa barbara in the department of economics i obtained a phd in economics from princeton university in may 2025 i study macroeconomics public finance and labor you can find my cv here contact information margolin ucsb edu twitter simon_margolin 2127 north hall university of california santa barbara ca 93106 9210 working papers the green lerner index paper with emma bursztejn abstract this paper shows how climate externalities change antitrust targeting we build a general equilibrium oligopoly model with antitrust enforcement and greenhouse gas emissions the central trade off is that stronger competition reduces market power distortions but can increase emissions by expanding output in polluting industries we introduce a green lerner index gli that combines the private markup wedge with marginal climate damages and accounts for cross sector reallocation calibrating the model with u s concentration emissions and output data we show that the gli ranking substantially changes enforcement priorities polluting industries become less attractive targets while cleaner industries move up in the enforcement ranking our results show that emissions adjusted targeting reduces the environmental cost of antitrust enforcement micro vs macro corporate tax incidence paper abstract this paper studies how firm level responses to corporate tax changes map into the aggregate welfare effects of corporate tax reforms i develop a dynamic model with heterogeneous firms and monopsonistic labor markets that replicates reduced form estimates of firm level responses and derives sufficient statistics characterizing the forces that link these responses to workers welfare incidence calibrated to us data the model implies that firm level estimates overstate short run wage gains from corporate tax cuts but understate long run gains these labor market gains are small relative to workers fiscal losses when corporate tax cuts are financed by higher labor taxes unemployment insurance and the quality of job seekers paper abstract this paper investigates the optimal design of unemployment insurance ui and explores how ui affects the quality of the job seeker pool using a directed search model with endogenous search effort and asymmetric information between workers and recruiters i show that higher levels of ui can exacerbate adverse selection by incentivizing low productivity workers to apply for high wage jobs and crowd out productive applicants however the model reveals a mitigating effect increased ui reduces the number of applications from low productivity workers alleviating this adverse selection inefficiency the model is calibrated using data from the survey of consumer expectations and the current population survey to quantify these two forces and the welfare effects of unemployment insurance showing that the current level of benefits implemented in the us is close to but slightly below the optimal one work in progress who can afford to go green optimal environmental policy under credit constraints with alicia zhang abstract environmental policy often relies on pricing brown externality producing goods to internalize damages this principle follows a classic result in the pigouvian taxation literature which argues that directly taxing the externality is optimal this paper reexamines optimal pigouvian taxation in light of income dynamics borrowing constraints and a fixed cost of switching between a brown good and a substitutable green good we show that subsidizing the substitutable green good may be optimal in conjunction with or instead of taxing the brown good a brown tax can only induce switching to the green good for households that can already finance the fixed cost while a green subsidy expands the extensive margin by making adoption feasible we test these predictions using evidence from electric vehicle subsidies in california zip codes with lower credit scores exhibit larger responses to the incentive payment consistent with our theory that borrowing constraints can affect adoption decisions quantitatively we find that a subsidy can increase the share of individuals who can afford to switch to the green technology leading to higher welfare while achieving a given adoption target firm specific human capital and labor market power with john grigsby and gianluca violante abstract we analyze the implications of firm specific human capital for labor market power and the transmission of productivity shocks to wages we incorporate firm specific human capital into a model of the labor market featuring oligopsonistic employers our findings reveal that the degree of pass through from productivity shocks to wages depends on the specificity of these shocks when workers experience productivity gains that are limited to a subset of firms employers capture a substantial portion of these gains through wider markdowns furthermore we show that wider markdowns may signal either higher labor market concentration e g driven by reduced firm entry or stronger technological specificity e g due to a higher division of labor these different sources of labor market power carry distinct policy implications while market concentration calls for antitrust interventions and restrictions on non compete agreements addressing technological specificity may require education policies or active labor market policies aimed at broadening worker skills corporate bankruptcy as worker insurance with maxime gravoueille and thomas zuber abstract this paper studies the trade offs in reorganization bankruptcy e g chapter 11 of the us bankruptcy code between protecting workers from job displacement and reallocating resources to more productive firms using data from over 148 000 bankruptcy filings in france between 2008 and 2017 matched with administrative employer employee panel data we document the costs of delayed reallocation by showing that most firms undergoing reorganization have experienced permanent productivity shocks with a majority eventually facing liquidation on the other hand we document the insurance benefits of reorganization by comparing worker outcomes in firms that experience liquidation versus those that reorganize we find that reorganization significantly reduces long run earnings losses we develop a model that captures the optimal allocation of reorganization and liquidation by bankruptcy courts under imperfect information as they struggle to distinguish between temporary and permanent shocks when firms file for bankruptcy reorganization allows extended observation periods enabling courts to better assess firm viability this framework highlights the benefits of reorganization during periods of aggregate uncertainty such as the covid 19 pandemic optimal bankruptcy procedures balance resource reallocation worker protection and informational advantages teaching macro public finance 2nd year phd ucsb winter 26 topics in macroeconomics undergrad ucsb winter 26 google sites report abuse page details page updated google sites report abuse this site uses cookies from google to deliver its services and to analyze traffic information about your use of this site is shared with google by using this site you agree to its use of cookies learn more got it