Search Results
Working Paper
The boy who cried bubble: public warnings against riding bubbles
Attempts by governments to stop bubbles by issuing warnings seem unsuccessful. This paper examines the effects of public warnings using a simple model of riding bubbles. We show that public warnings against a bubble can stop it if investors believe that a warning is issued in a definite range of periods commencing around the starting period of the bubble. If a warning involves the possibility of being issued too early, regardless of the starting period of the bubble, it cannot stop the bubble immediately. Bubble duration can be shortened by a premature public warning, but lengthened if it is ...
Report
Gender discrimination and social identity: experimental evidence from urban Pakistan
Gender discrimination in South Asia is a well-documented fact. However, gender is only one of an individual?s many identities. This paper investigates how gender discrimination depends on the social identities of interacting parties. We use an experimental approach to identify gender discrimination by randomly matching 2,836 male and female students pursuing bachelor?s-equivalent degrees in three different types of institutions?Madrassas (religious seminaries), Islamic universities, and liberal universities?that represent distinct identities within the Pakistani society. Our main finding is ...
Working Paper
A Theoretical Treatment of Foreign Fighters and Terrorism
The paper offers a game-theoretical model that includes three participants – the terrorist organization, its foreign fighters, and the adversarial host government. In stage 1, the terrorist group induces foreign fighters to emigrate through wage incentives, while the host government deters these fighters through proactive border security. Foreign fighters decide whether to emigrate from their source country (extensive margin) in stage 2, after which these fighters determine their level of attacks (intensive margin) in stage 3. Comparative statics to the Nash equilibrium are tied to changes ...
Journal Article
The Trade-Offs of Counterterrorism Policies
This article provides a modern overview of counterterrorism tools and their trade-offs for curbing terrorist attacks and their consequences. Defensive and proactive countermeasures constitute two main classes of counterterror tools deployed by targeted governments. The primary drawback of defensive actions, which make terrorist attacks more costly and less apt to succeed, is attack transference that shifts the mode, venue, or target of attacks to those less protected. In contrast, offensive proactive measures, which confront the terrorists directly, may result in backlash as terrorist ...
Working Paper
Voluntary participation in a terror group and counterterrorism policy
A three-stage game investigates how counterterrorism measures are affected by volunteers’ choice in joining a terrorist group. In stage 1, the government chooses both proactive and defensive countermeasures, while looking ahead to the anticipated size and actions of terrorist groups. After radicalized individuals choose whether to join a terrorist group in stage 2, group members then allocate their time between work and terrorist operations. Based on wages and government counterterrorism, the game characterizes the extensive margin determining group size and the intensive margin ...
Report
Anxiety and pro-cyclical risk taking with Bayesian agents
We provide a model that can explain empirically relevant variations in confidence and risk taking by combining horizon-dependent risk aversion (?anxiety?) and selective memory in a Bayesian intrapersonal game. In the time series, overconfidence is more prevalent when actual risk levels are high, while underconfidence occurs when risks are low. In the cross section, more anxious agents are more prone to biased confidence and their beliefs fluctuate more. This systematic variation in confidence levels can lead to objectively excessive risk taking by ?insiders? with the potential to amplify ...
Working Paper
Collusion in Repeated Auctions with Costless Communication
In this paper, we present a model of repeated first-price private value auctions in which the bidders have access to a cheap talk communication mechanism. In this framework, messages allow bidders to transmit their preference rankings over the goods to be auctioned, similar to Pesendorfer (2000). We show that collusion through this static mechanism not only dominates the static bid rotation mechanism presented by McAfee and McMillan (1992), but it is also not strictly dominated by the dynamic bid rotation mechanism presented by Aoyagi (2003). However, we show that asymptotic efficiency of ...
Working Paper
Superstar Economists: Coauthorship networks and research output
We study the impact of research collaborations in coauthorship networks on research output and how optimal funding can maximize it. Through the links in the collaboration network, researchers create spillovers not only to their direct coauthors but also to researchers indirectly linked to them. We characterize the equilibrium when agents collaborate in multiple and possibly overlapping projects. We bring our model to the data by analyzing the coauthorship network of economists registered in the RePEc Author Service. We rank the authors and research institutions according to their contribution ...
Working Paper
(A)symmetric Information Bubbles: Experimental Evidence
Asymmetric information has been necessary to explain a bubble in past theoretical models. This study experimentally analyzes traders? choices, with and without asymmetric information, based on the riding-bubble model. We show that traders have an incentive to hold a bubble asset for longer, thereby expanding the bubble in a market with symmetric, rather than asymmetric information. However, when traders are more experienced, the size of the bubble decreases, in which case bubbles do not arise, with symmetric information. In contrast, the size of the bubble is stable in a market with ...
Working Paper
Interjurisdictional Competition and Location Decisions of Firms
We examine the welfare properties of alternative regimes of interjurisdictional competition for heterogenous mobile firms. Firms differ not only in terms of the degree of mobility across jurisdictions but also in terms of productivity. Alternative taxation regimes represent restraints on the discretionary powers of taxation of local governments. We find that average welfare is higher under discretionary and more efficient taxation regimes (in the sense of minimizing deadweight losses from distortionary taxation) when firms are highly mobile. In this situation, further limiting competition by ...