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Selected recent publications in the top management and economics journals

Strategic decompositions of normal form games: Zero-sum games and potential games

( Hwang, Sung-Ha | Rey-Bellet, Luc )



We introduce new classes of games, called zero-sum equivalent games and zero-sum equivalent potential games, and prove decomposition theorems involving these classes of games. Two games are "strategically equivalent" if, for every player, the payoff differences between two strategies (holding other players' strategies fixed) are identical. A zero-sum equivalent game is a game that is strategically equivalent to a zero-sum game; a zero-sum equivalent potential game is a potential game that is strategically equivalent to a zero-sum game. We also call a game "normalized" if the sum of one player's payoffs, given the other players' strategies, is zero. One of our main decomposition results shows that any normal form game, whether the strategy set is finite or continuous, can be uniquely decomposed into a zero-sum normalized game, a zero-sum equivalent potential game, and an identical interest normalized game, each with distinctive equilibrium properties.

Impact of customers' digital banking adoption on hidden defection: A combined analytical-empirical approach

( Son, Yoonseock | Kwon, Hyeokkoo Eric | Tayi, Giri K. | Oh, Wonseok )



The implementation of digital channels as avenues for economic transactions (e.g., online and mobile banking/FinTech) has shifted the paradigm of customer-bank interactions, providing unprecedented opportunities for both parties. The prevailing belief is that digital banking has several advantages, such as lower costs and higher information transferability for customers. These benefits can also promote competition between banks given customers' predilection for "multi-homing," or engagement with multiple banks. This study investigated the impact of customers' digital banking adoption on hidden defection, in which customers purchase financial products from competing banks instead of their primary banks. To this end, we developed an analytical model to provide insights into the effects of digital banking adoption while taking customers' multi-homing behaviors into consideration. We then conducted a series of empirical analyses using comprehensive individual-level transaction data to provide evidence of hidden defection. Our findings indicate that customers with higher loyalty exhibit greater hidden defection after digital banking adoption. Customers who engage primarily with personal-service channels (e.g., branches) show stronger hidden defection than do self-service channel (e.g., ATMs) users, and this effect is more prevalent among loyal customers. Our results provide valuable implications for omni-channel services in a market characterized by multi-homing behavior of customers.

Quality Information Disclosure and Patient Reallocation in the Healthcare Industry: Evidence from Cardiac Surgery Report Cards

( Yoon, Tae Jung )



In a healthcare industry with capacity constraints, the best healthcare providers are often congested after quality information disclosure. This congestion can lead to the reallocation of urgent patients to low-quality healthcare providers. The reallocation can have a detrimental impact on the overall patient survival rate if sicker patients benefit more from the best providers. This paper provides the first empirical evidence regarding this problem in the context of the publication of cardiac surgery report cards. I find that these report cards can have a negative impact on positive assortative matching between patients and surgeons because of a reallocation of high-risk patients to low-quality surgeons. Despite the quality improvement in response to these report cards, such patient reallocation can still be a problem, conditional on the improved quality, and, thus, should not be ignored.

Financing dies in darkness? The impact of newspaper closures on public finance

( Gao, Pengjie | Lee, Chang Joo | Murphy, Dermot )



We examine how local newspaper closures affect public finance outcomes for local governments. Following a newspaper closure, municipal borrowing costs increase by 5 to 11 basis points, costing the municipality an additional $650 thousand per issue. This effect is causal and not driven by underlying economic conditions. The loss of government monitoring resulting from a closure is associated with higher government wages and deficits, and increased likelihoods of costly advance refundings and negotiated sales. Overall, our results indicate that local newspapers hold their governments accountable, keeping municipal borrowing costs low and ultimately saving local taxpayers money.

Time to Build and the Real-Options Channel of Residential Investment

( Oh, Hyunseung | Yoon, Chamna )



A standard real-options model predicts that time-to-build investment decisions could be delayed by uncertainty over future revenue. This paper examines the first-order importance of this mechanism by looking into the micro-data for residential construction during the recent housing boom and bust. We develop a model of sequential irreversible investment with stochastic bottlenecks and estimate the model parameters based on the distribution of time-to-build and new house prices. In the estimated model, the boom period increase in time-to-build is caused by frequent construction bottlenecks, and the decrease in house prices and the increase in uncertainty during the bust generated further delays in construction.

Contact : Joo, Sunhee ( shjoo2006@kaist.ac.kr )

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