I am an Assistant Professor of Finance at Columbia Business School. Welcome to my webpage.

I do research in International Finance and Macroeconomics, with secondary interests in Industrial Organization and Networks Theory. I am also an Affiliate Fellow at the University of Chicago Stigler Center and an Affiliate Member of the CESifo Research Network.

bp2713 [at]

 +1 (312) 257-8888


RESEARCH  (Working Papers)

Product Differentiation and Oligopoly: a Network Approach

Revise & Resubmit (2nd round), American Economic Review

Abstract: This paper develops a theory of oligopoly and markups in general equilibrium. Firms compete in a network of product market rivalries that emerges endogenously out of the characteristics of the products and services they supply. My model embeds a novel, highly tractable and scalable demand system (GHL) that can be estimated for the universe of public corporations in the USA, using publicly-available data. Using the model, I compute firm-level markups and decompose them into: 1) a new measure of firm productivity that accounts for product quality; 2) a metric of network centrality, which captures the extent of competition from substitute products. I estimate that, in 2019, public corporations produced consumer surplus in excess of 10 US$ trillions (against $3 trillions of profits). Oligopoly lowers total surplus by 11.5% and depresses consumer surplus by 31%. My analysis also suggests that both numbers were significantly lower in the mid-90s (7.9% and 21.5%, respectively). These results should be interpreted with care due to data limitations.

Non-Technical Summary: [Pro-Market @ Chicago Booth]

Presentations: NBER Economic Fluctuations and Growth, NBER Industrial Organization, NBER Mega-Firms Conference, NBER Summer Institute (Income Distribution and Macro), Columbia BS Finance, UPenn Wharton, Columbia Macroeconomics, Northwestern Kellogg (Finance), Northwestern Kellogg (MEDS), UMaryland (Economics Dept.),  University of Maryland Smith, University of Cambridge, University of Southern California (Economics Dept.), UMinnesota Carlson, Texas A&M Mays, Bank of Italy, Stockholm IIES, Einaudi Institute for Economics and Finance (EIEF), Swiss Finance Institute/EPFL, Bocconi University, American Finance Association, Western Finance Association, Society for Economic Dynamics, SFS Cavalcade North America, Texas Finance Festival, BSE Summer Forum, UK Competition & Markets Authority, Hellenic Competition Commission, UChicago Networks Conference, Oxford Firm Heterogeneity & the Macroeconomy, Finance Organizations and Markets (FOM), EARIE, Econometric Society European Meeting, IIOC,  American Economic Association, Royal Economic Society, Econometric Society World Congress, European Economic Association, Oligo Workshop.

A Tale of Two Networks: Common Ownership and Product Market Rivalry (with Florian Ederer)

Revise & Resubmit, Review of Economic Studies

AbstractWe study the welfare implications of the rise of common ownership in the United States from 1994 to 2018. We build a general equilibrium model with a hedonic demand system in which firms compete in a network game of oligopoly. Firms are connected through two large networks: the first reflects ownership overlap, the second product market rivalry. In our model, common ownership of competing firms induces unilateral incentives to soften competition. The magnitude of the common ownership effect depends on how much the two networks overlap. We estimate our model for the universe of U.S.~public corporations using a combination of firm financials, investor holdings, and text-based product similarity data. We perform counterfactual calculations to evaluate how the efficiency and the distributional impact of common ownership have evolved over time. According to our baseline estimates the welfare cost of common ownership, measured as the ratio of deadweight loss to total surplus, has increased nearly tenfold (from 0.3% to over 4%) between 1994 and 2018. Under alternative assumptions about governance, the deadweight loss ranges between 1.9% and 4.4% of total surplus in 2018. The rise of common ownership has also resulted in a significant reallocation of surplus from consumers to producers.

Non-Technical Summary: [Pro-Market @Chicago Booth] [Harvard Law School Corporate Governance Forum

Presentations: NBER Mega-Firms Conference, NBER Organizational Economics, NYU Stern, USC Marshall, Duke Fuqua, Federal Trade Commission, Berkeley/Columbia/Duke/MIT/Nortwhestern IO Theory Conference, UTDT Annual Conference, Finance, Organizations & Markets, American Economic Association, American Finance Association, Equitable Growth Conference, Swiss Finance Institute/USI, Cambridge Judge, Red Rock Finance Conference, Econometric Society European Meeting, BSE Summer Forum, Society for Economic Dynamics, GMU Center for Micro-Economic Policy, European Finance Association, North American Econometric Society Summer Meeting, Midwest Finance Association, CEPR FirmOrgDyn, Cambridge Network Economics Conference, ALEA, SAET.

Barriers to Global Capital Allocation (with Enrico Spolaore and Romain Wacziarg)

Reject and Resubmit, Quarterly Journal of Economics

Abstract: International portfolios and heterogeneity in the rate of return to capital across countries are hard to reconcile with frictionless capital markets. In this paper, we develop a quantitative theory of international capital allocation: a multi-country dynamic general equilibrium model in which the entire network of cross-border investment is endogenously determined. The model features not only country heterogeneity in fundamental risk but also (crucially) a rich set of policy and information frictions that distort international capital flows. It embeds rationally-inattentive investors and it produces closed-form solutions for international portfolios that follow a logit form. We take the model to the data using a parsimonious (yet easily extendable) set of frictions: capital income taxes, political risk, and measures of geographic, linguistic, and cultural distance between countries. Our framework accounts well for international portfolio patterns, the cross-section of home bias and rates of returns to capital, and other key features of international capital markets. Finally, we perform counterfactual exercises: in particular, we show that barriers to international investment reduce world output by about 6% and can account for nearly half of the observed cross-country inequality in capital per employee.

Presentations: NBER International Finance & Macroeconomics, Princeton University, UC Berkeley Economics, London Business School, USC Marshall, OSU Fisher, UT Austin McCombs, U.Washington Foster, UChicago International Macro-Finance Conference, Online International Finance & Macro Seminar (OIFM), BSE Summer Forun, CESifo Macro Money and Finance, American Finance Association, Society for Economic Dynamics, Colorado Winter Finance Summit, European Finance Association, HEC-CEPR Macro-Finance Conference, Yale Junior Finance Conference, D.C. Junior Finance Conference, WEFIDEV, CSEF-DISES U. of Naples Federico II, US International Trade Commission, Econometric Society (ASSA), European Economic Association, Money Macro and Finance Society, FIW Conference, IBEFA Young Economist Seminar Series, RCEA Money Macro & Finance, T3M.

Abstract: We study the impact of the last five decades of financial globalization on world GDP and income distribution, employing a novel multi-country dynamic general equilibrium model that embeds a demand system for international assets. We introduce, estimate and validate new country-level measures of inward and outward Revealed Capital Account Openness (RKO), which are derived from wedge accounting. The implementation of our framework requires only minimal data, which is available as early as 1970 (national income accounts, external assets and liabilities positions). Our RKO wedges reveal enormous heterogeneity in the pace of capital account liberalization, with richer countries liberalizing much faster than poorer ones. We call this pattern Unbalanced Financial Globalization. We then utilize our model to simulate a counterfactual trajectory of the global economy, where the RKO wedges are fixed at their pre-globalization levels. We find that unbalanced financial globalization led to a worsening of capital allocation (lowering world GDP by 1.4%), a 10% rise in the cross-country dispersion of GDP per capita, lower wages in poorer countries and lower cost of capital in high-income countries. These findings stand in sharp contrast to the predictions of standard models of financial markets integration, where capital account barriers decline symmetrically across countries. We also study counterfactual globalization patterns where countries open their capital account in a symmetric or convergent fashion, and find that these scenarios produce diametrically opposite effects (significant improvements in capital allocation efficiency and lower cross-country inequality, higher wages in poor countries, etc..). These findings underscore the pivotal role played by country heterogeneity in shaping the real effects of capital markets integration.

Presentations: GWU International Macro Seminar (scheduled), CEPR Salento Macro Meetings, CESifo Macro Money and International Finance; DC Junior Finance Conference, Washington Area International Finance Symposium, American Economic Association, European Economic Association, IMF Annual Macro-Finance Conference, CKGSB.

Abstract: In the seminal rational inattention model of Matêjka and McKay (2015), logit demand arises from the discrete choice of agents who are uncertain about choice payoffs and have access to a flexible, costly information acquisition technology (RI-logit). A notable limitation of this powerful framework is the lack of known general closed-form solutions that allow the decision maker's prior information to be asymmetric across choices. In this paper, I solve the RI-logit model analytically for a large family of priors known as multivariate Tempered Stable (TS) distributions. In my analytical formulation, decision makers can be biased, display aversion to prior uncertainty, and thus tend to select choices that are familiar (i.e. for which they hold a less disperse prior). My result extends the applicability of the RI-logit model to a new range of settings where prior information matters. I provide one such application, by showing how it can be used to model the behavior of risk-averse investors who select risky projects in an environment characterized by epistemic uncertainty (risk-adjusted expected returns are unknown, but can be learnt at a cost).

Presentations: Econometric Society/ASSA (scheduled).


Abstract: An important strand of research in macro-finance investigates which factors impede enterprise investment, and quantifies their aggregate cost. In this paper, we make two contributions to this literature. The first contribution is methodological: we introduce a novel framework to calibrate macroeconomic models with firm-level distortions using enterprise survey micro-data. The core of our innovation is to explicitly model the firms' decisions to report the distortions they face in the survey. Our second contribution is to apply our method across eighty-five countries to characterize the distribution of these distortions and estimate the GDP loss induced by distortionary red tape. Our estimates are based on a dynamic general equilibrium model with heterogenous firms whose capital investment decisions are distorted by red tape. We find that the aggregate cost of red tape varies widely across the countries in our dataset, with an average of 1.8 to 2.1% of GDP and a total of 1.6 trillion dollars. Our framework opens up a new range of applications for enterprise surveys in macro-financial modeling and policy analysis.

Presentations: UChicago Booth, BSE Summer Forum, CEBRA, Econometric Society Asia Meeting, American Economic Association, Econometric Society European Meeting, ESCOE, UCLA-UCBerkeley Political Economy Workshop, DC Junior Finance Conference, London Business School (TADC).

The Great Startup Sellout and the Rise of Oligopoly (with Florian Ederer)

American Economic Association: Papers & Proceedings (May 2023)

Abstract: We document a secular shift from IPOs to acquisitions by venture capital-backed startups and show that this trend is accompanied by an increase in the opportunity cost of going public. Dominant companies that are disproportionately active in the corporate control market for startups have become more insulated from the product market competition over the same period. These facts are consistent with the hypothesis that startup acquisitions have contributed to rising oligopoly power.

Non-Technical Summary: [Columbia Blue Sky Blog

Presentations: Harvard Junior Innovation Conference, IIOC, American Economic Association.

Mergers and Acquisitions under Common Ownership (with Miguel Antón, Mireia Giné, and Florian Ederer)

American Economic Association: Papers & Proceedings (May 2023)

Abstract: We provide new facts about the cross-section and evolution of mergers and acquisitions for US public firms. Using a general equilibrium model with a hedonic demand system and data on institutional ownership, we document that mergers are increasingly concentrated among firm pairs with a high degree of product market interaction and a moderate-to-high degree of common ownership. We estimate how much mergers have raised aggregate corporate profits and reduced consumer surplus and quantify how the anti-competitive effects of mergers are affected by common ownership and shareholder value maximization motives.


Crushing the Competition: the Product Market Effects of Relative Performance Evaluation Networks

Abstract: Relative Performance Evaluation (RPE) is a prevalent feature of executive compensation contracts designed to incentivize managerial effort. A lesser-known (but theoretically straightforward to prove) side effect of RPE is to modify competitive behavior in oligopolistic industries. Specifically, it incentivizes managers to undermine competitors’ profits instead of solely focusing on maximizing their own firm’s income. To quantify this effect, I develop a general equilibrium model with GHL demand that realistically incorporates these incentives, where firms engage in a network oligopoly game. In this model, the pro-competitive impact of RPE hinges on the degree of overlap between the network of rivalries and the network of RPE benchmarking relationships. To delineate the latter, we process highly-unstructured data from over 15,000 executive compensation contracts. I then employ the model to determine, on a firm-by-firm basis, the influence of RPE on supply decisions, prices, allocative efficiency, and consumer welfare.

Presentations: UChicago Stigler Center Affiliate Conference, SIOE.


AbstractItaly’s aggregate productivity abruptly stopped growing in the mid-1990s. This stop represents a puzzle, as it occurred at a time of stable macroeconomic conditions. In this paper, we investigate the possible causes of this “disease” by using sector and firm-level data. We find that Italy’s productivity disease was most likely caused by the inability of Italian firms to take full advantage of the ICT revolution. While many institutional features can account for this failure, a prominent one is the lack of meritocracy in the selection and rewarding of managers. Unfortunately, we also find that the prevalence of loyalty-based management in Italy is not simply the result of a failure to adjust, but an optimal response to the Italian institutional environment. Italy’s case suggests that familism and cronyism can be serious impediments to economic development even for a highly industrialized nation.

Non-technical summaries: [VoxEU] [Pro-Market]    -    Wikipedia Entry: [Economic history of ItalyPress Coverage: [Bloomberg (1)] [Bloomberg (2)] [Bloomberg (3)] [Washington Post] [Project Syndicate] [II Sole 24 Ore] [Barron's] [Corriere della Sera] [LaRepubblica]  [Frankfurter Allgemeine]

Presentations: Cornell U. "100 years of Development", American Economic Association, European Economic Association, UCLA Anderson-UCBerkeley Haas Political Economy Workshop.