Publications

January 2021
Article

Chain Stability in Trading Networks

By: John William Hatfield, Scott Duke Kominers, Alexandru Nichifor, Michael Ostrovsky and Alexander Westkamp

We show that in general trading networks with bilateral contracts, a suitably adapted chain stability concept (Ostrovsky, 2008) is equivalent to stability (Hatfield and Kominers, 2012; Hatfield et al., 2013) if all agents' preferences are fully substitutable and... View Details

Keywords: Matching; Trading Networks; Chain Stability; Stability; Competitive Equilibria; Full Substitutability; Laws Of Aggregate Supply And Demand; Contracts; Market Design; Balance and Stability

January 2021 (Revised October 2021)
Case

eToro: Building the World's Largest Social Trading Network

By: Elie Ofek and Danielle Golan

Social trading platform eToro was preparing for the launch of its expanded offering in the U.S. The company faced critical decisions regarding product-market fit, go-to-market strategy, positioning and monetization. Moreover, it faced the challenge of how best to make... View Details

Keywords: Social Trading Platform; Investment; Social and Collaborative Networks; Marketing Strategy; Expansion; Digital Platforms

Educators

Article

Stability and Competitive Equilibrium in Trading Networks

By: John William Hatfield, Scott Duke Kominers, Alexandru Nichifor, Michael Ostrovsky and Alexander Westkamp

We introduce a model in which agents in a network can trade via bilateral contracts. We find that when continuous transfers are allowed and utilities are quasi-linear, the full substitutability of preferences is sufficient to guarantee the existence of stable outcomes... View Details

Keywords: Balance and Stability; Markets

February 2017
Article

Resident Networks and Corporate Connections: Evidence from World War II Internment Camps

By: Lauren Cohen, Umit Gurun and Christopher J. Malloy

We demonstrate that simply by using the ethnic makeup surrounding a firm’s location, we can predict, on average, which trade links are valuable for firms. Using customs and port authority data on the international shipments of all U.S. publicly traded firms, we show... View Details

Keywords: Information Networks; Trade Links; Firm Behavior; Networks; Geographic Location; Ethnicity; Organizations; Trade

July 1998 (Revised February 2000)
Case

TPN Register: The Trading Process Network

By: Lynda M. Applegate

Keywords: Market Transactions; Information Technology

March 2021
Teaching Note

eToro: Building the World’s Largest Social Trading Network

By: Elie Ofek

2015
Working Paper

Collateral Shortages and Intermediation Networks

By: Marco Di Maggio and Alireza Tahbaz-Salehi

This paper argues that in the presence of trading frictions and agency problems, the interbank market may be overly fragile, in the sense that small changes in the liquidity of assets used as collateral may lead to large swings in haircuts and a potential credit... View Details

Keywords: Financial Intermediation; Financial Networks; Secured Lending; Collateral; Repo Runs; ABCP Collapse; Networks; Negotiation; Financing and Loans; Financial Crisis

November 2019
Article

The Relevance of Broker Networks for Information Diffusion in the Stock Market

By: Marco Di Maggio, Francesco Franzoni, Amir Kermani and Carlo Sommavilla

This paper shows that the network of relationships between brokers and institutional investors shapes information diffusion in the stock market. We exploit trade-level data to show that central brokers gather information by executing informed trades, which is then... View Details

Keywords: Broker Networks; Institutional Investors; Asset Prices; Business and Shareholder Relations; Institutional Investing; Information; Knowledge Dissemination; Financial Markets; Asset Pricing

Article

The Value of Trading Relations in Turbulent Times

By: Marco Di Maggio, Amir Kermani and Zhaogang Song

This paper investigates how dealers’ trading relations shape their trading behavior in the corporate bond market. Dealers charge lower spreads to dealers with whom they have the strongest ties and more so during periods of market turmoil. Systemically important dealers... View Details

Keywords: OTC Markets; Network; Corporate Bonds; Crisis; Intermediation Chains; Leaning Against The Wind; Networks; Bonds; Behavior; Financial Crisis

August 2014
Article

Friends in High Places

By: Lauren Cohen and Christopher Malloy

We demonstrate that personal connections amongst U.S. politicians have a significant impact on Senate voting behavior. Networks based on alumni connections between politicians are consistent predictors of voting behavior. We estimate sharp measures that control for... View Details

Keywords: Vote Trading; Networks; Legislation; Logrolling; Earmarks; Voting; Government Legislation; Social and Collaborative Networks; United States

2023
Working Paper

Mapping Organizational-Level Networks Using Individual-Level Connections: Evidence from Online Professional Networks

By: Shelley Xin Li, Frank Nagle and Aner Zhou

Organization-level networks facilitate the flow of information and business activities in the economy. Prior research relies solely on high-level connections to measure these networks. Therefore, to understand the role of employee connections at all job levels in... View Details

Keywords: Networks; Value; Social and Collaborative Networks; Innovation and Invention; Knowledge Sharing; Employees; Social Media

SSRN

August 2019
Case

Huawei and the U.S.-China Trade War

By: Elie Ofek and John Masko

In 2019, Chinese smartphone maker and telecommunications empire Huawei was preparing to launch its new flagship smartphone series, the Mate 30. After years of explosive growth, the previous 18 months had been a challenge for the company. In early 2018, Huawei’s planned... View Details

Keywords: Trade; Global Strategy; International Relations; National Security; Mobile and Wireless Technology; Information Infrastructure; Volatility; Adaptation; Telecommunications Industry; China; United States; European Union

Educators

2016
Working Paper

Through the Grapevine: Network Effects on the Design of Executive Compensation Contracts

By: Susanna Gallani

Effective design of executive compensation contracts involves choosing and weighting performance measures, as well as defining the mix between fixed and incentive-based pay components, with a view to fostering talent retention and goal congruence. The variability in... View Details

Keywords: Compensation Design; Board Interlocks; Compensation Consultants; Network Centrality; Homophily; Quadratic Assignment Procedure; Blockholders; Executive Compensation

SSRN

08 Jun 2011
Lessons from the Classroom

Twenty-first Century Skill: Trading Carbon Credits

Cap and trade has become an increasingly popular mechanism used by governments to induce green behavior among corporate polluters, with news emerging almost daily. Just recently New Jersey Governor Chris Christie withdrew his state from the Regional Greenhouse Gas... View Details

Keywords: by Julia Hanna; Energy; Utilities

The Value of Trading Relationships in Turbulent Times

Our recent work investigates dealers' trading behavior and pricing strategy in the corporate bond market to shed new light on the role of the network of existing relationships among dealers in shaping the transmission of risk and influencing market liquidity. We show... View Details

2009
Other Unpublished Work

Heterogeneous Technology Diffusion and Ricardian Trade Patterns

By: William R. Kerr

This study tests the importance of Ricardian technology differences for international trade. The developed panel includes both emerging and advanced economies, and particular attention is devoted to the variation exploited in empirical tests. The elasticity of export... View Details

Keywords: Trade; Immigration; Competitive Advantage; Integration; Technology; United States