東北大学
現代経済学研究会
この研究会について:
 2006年度より、東北大学に在籍する経済学研究者有志が集まって定期的に研究会を開催することになりました。本研究会では国際的学術雑誌への投稿を精力的に行っている第一線の研究者に研究発表をお願いしています。参加資格は特に設けませんので、報告論題に関心のある方は奮ってご参加ください。学内の方はもちろん、学外の方もご参加いただけます。

 開催予定はあくまで暫定であり、日時が変更されたりキャンセルされる場合があります。ご注意ください。

アクセス情報:
 第401演習室は、経済学部研究棟ではなく、文科系総合研究棟(教育学研究科が入居している建物)の4階にあるのでご注意ください。
 経済学研究科へのアクセスと川内キャンパス内の建物の配置についてはこの地図をご参照ください(地図中のC16が経済学部研究棟、C14が文科系総合研究棟です)。

共催情報:
 今年度の研究会は全てサービス・データ科学研究センターワークショップとの共催です。
 サービス・データ科学研究センターについてはこのサイトをご参照ください。









セミナー幹事: 松前 龍宜
matsumae@econ.tohoku.ac.jp

2017年12月21日(木) 16:20-17:50 第401演習室(文科系総合研究棟4階)
                 

海老名剛 氏 (明治大学)

Demand Uncertainty, Product Differentiation, and Entry Timing Under Spatial Competition

Abstract: We investigate the entry timing and location decisions under market-size uncertainty with Brownian motions i n a continuous-time spatial competition duopoly model a la d'Aspremont et al. (1979). Under a sequential equilibrium, the threshold of the follower non-monotonically increases in volatility, which is in stark contrast to the extant results in the real options literature. Also, although the follower's entry timing tends to be late as the volatility becomes amplified, the leader is more likely to increase the degree of product differentiation as the volatility gets higher. Finally, we compare the equilibrium entry decisions with the second-best ones.



2018年1月25日(木) 16:20-17:50 第401演習室(文科系総合研究棟4階)
Language: English

Yong-Seung Jung 氏 (Kyung Hee University)

Title: TBA (abstract)

TBA


2018年2月1日(木) 16:20-17:50 第401演習室(文科系総合研究棟4階)

直井道生 氏 (慶應義塾大学)

Title: Natural Hazard Information and Migration across Cities: Evidence from the Nankai Trough Earthquake (abstract)

This paper examines the causal effect of the predicted seismic movements and their resulting tsunami on human migration across 251 coastal and their 179 neighboring municipalities in Japan. Using the difference-in-differences method, we find that an increase in predicted tsunami height is significantly associated with a reduction in net migration. We also find that an increase in predicted tsunami height has a persistent negative impact on the in-migration throughout our sample period, whereas it has only a temporal impact on the out-migration. An increase in predicted seismic movement, on the other hand, is significantly associated with a reduction in in-migration only for the year immediately after the dissemination of updated hazard information. Our empirical findings suggest that, after the dissemination of updated tsunami predictions, people are likely to move to less risky areas.


2018年2月22日(木) 16:20-17:50 第401演習室(文科系総合研究棟4階)

楡井誠 氏 (東京大学)

Title: TBA (abstract)

TBA


2018年3月8日(木) 16:20-17:50 第401演習室(文科系総合研究棟4階)

石井良輔 氏 (帝京大学)

Title: TBA (abstract)

TBA


2018年3月22日(木) 16:20-17:50 TBA

橋本和彦 氏 (大阪経済大学)

Title: TBA (abstract)

TBA



これまでの研究会:

2017年4月20日(木) 16:20-17:50 第21演習室(文科系総合研究棟10階)
Language: English, 応用統計計量ワークショップとの共催

Chung-Fang Chiang 氏 (National Taiwan University)

Title: What do voters learn from foreign news? Experimental Evidence on PTA diffusion in Japan and Taiwan (abstract)

What are the effect of foreign news exposure on voter policy preferences? The proportion of news reports about foreign government actions, relative to domestic government actions, has increased dramatically during the past decades. This paper tests three hypotheses on what voters learn from foreign news in forming their opinions on a forthcoming trade agreement: self-interests, socio-tropic inference and the extraction of government competence signal. We designed and conducted two-waves of coordinated survey experiments in Japan and Taiwan in 2015, which randomly assigned different but factual news reports of their neighboring countries (Korea and China) signing a trade agreement, and solicit support for their own government signing an agreement with China. The results suggest that exposure to foreign news increases opposition to PTA with China around 7% points in Japan and decreases opposition by 6%-7% points in Taiwan.? In both countries, socio-tropic inference shapes respondent attitudes and respondents did not seem to learn self-interests or sectoral distributional implications from the foreign news reports. The findings shed new lights on the voter-based mechanisms underlying diffusion of economic policies across countries.?


2017年4月27日(木) 16:20-17:50 第401演習室(文科系総合研究棟4階)

鈴木慶春 氏 (千葉大学)

Title: Competition, Patent Protection, and Innovation in an Endogenous Market Structure (abstract)

This study revisits the relationship between competition and innovation by incorporating an endogenous market structure in a dynamic general equilibrium model. We consider a free-entry model that the leader engages in Cournot competition with both non-innovative and innovative followers in each industry. A competition-enhancing policy, which reduces entry cost, can stimulate the entry of innovative followers when the entry cost is high. However, when the entry cost is sufficiently low, the entry of non-innovative followers crowds out innovative followers from the market. As a result, there is a non-monotonic relationship (inverted-V shape) between competition and innovation. Furthermore, we show that, while strengthening patent protection positively affects innovation when competition is sufficiently intense, the effect may be negative under milder competition. This suggests that a competition policy could complement a patent policy.


2017年5月25日(木) 16:20-17:50 第401演習室(文科系総合研究棟4階)

稲葉大 氏 (関西大学)

Title: Regional Business Cycle and Growth Features of Japan (abstract)

We study the features of regional business cycles and growth in Japan. We find evidence of unconditional convergence over the 1955-2008 period. For the 1975-2008 period, we find evidence of convergence conditional on TFP gap, population growth, private investment rate and TFP growth. We also find that the consumption-output correlation puzzle exists, which implies that the idiosyncratic income shocks are not shared among prefectures and regions. Our analysis implies that frictions in financial markets are responsible for the low consumption risk-sharing among prefectures.


2017年6月1日(木) 16:20-17:50 第401演習室(文科系総合研究棟4階)

奴田原健悟 氏 (専修大学)

Title: Can the Laffer curve for consumption tax be hump-shaped? (abstract)

This paper characterizes the shape of the Laffer curve for consumption tax analytically. The Laffer curve for consumption tax can be hump-shaped if the utility function is an additively separable one in consumption and labor supply. Conversely, it cannot be hump-shaped if the utility function is the one employed by previous researchers. The difference in the utility functions has quantitatively significant effects on the peak tax rates of the Laffer curves for labor and capital income taxes.


2017年6月15日(木) 16:20-17:50 第401演習室(文科系総合研究棟4階)

堀健夫 氏 (東京工業大学)

Title: Monetary Policy, Financial Frictions, and Heterogeneous R&D Firms in an Endogenous Growth Model (abstract)

Motivated by the empirical facts, we construct an endogenous growth model in which heterogeneous R&D firms are financially constrained and use cash to finance R&D investments. The interaction between financial constraints and heterogeneity is an important determinant of the optimality of the Friedman rule. If there are no financial frictions, the presence of heterogeneity does not affect the optimality of the Friedman rule. If there are severe financial frictions, however, heterogeneity has an important effect. Without heterogeneity, the Friedman rule is optimal. However, with heterogeneity among R&D firms, deviating from the Friedman rule improves social welfare under a plausible condition.


2017年6月29日(木) 16:20-17:50 第401演習室(文科系総合研究棟4階)

松島法明 氏 (大阪大学)

Title: Naked Exclusion under Exclusive-offer Competition (abstract)

This study constructs a model of anticompetitive exclusive-offer competition between two existing suppliers. Although previous studies assume that one of the suppliers is a potential entrant, which cannot make an exclusive offer, we assume that all suppliers are existing firms. When suppliers compete imperfectly, the exclusive-offer competition reduces the supplier’s profit for the case where it fails to exclude the rival supplier, which induces each supplier to make a better exclusive offer. We point out that this leads to an exclusion of the existing supplier even when there is no exclusion of the potential entrant.


2017年7月6日(木) 14:40-16:10 第21演習室(文科系総合研究棟10階)
応用統計計量ワークショップとの共催:いつもと会場と時刻が異なります.

井深陽子 氏 (慶應義塾大学)

Title: Regional Variations in Access to Healthcare among Japanese Individuals Over 50 Years Old: An analysis using JSTAR (abstract)

Studies have repeatedly reported regional variations in health conditions within a country, but the reason behind such disparities is still under debate. In this study, among the contributors to health disparities, we focus on healthcare-seeking behavior. We examine how regional characteristics affect such behavior of individuals over 50 years old regarding screening and controlling common chronic conditions such as hypertension, hypercholesterolemia, and diabetes. Our analysis using the Japanese Study of Aging and Retirement (JSTAR) shows that there are differences of at least three to 10 percentage points in the proportion of those who seek care across 10 areas covered. On applying a multilevel regression framework, we find that the vast majorities of these differences are due to composition effects, namely, the difference in the distribution of health risk at the individual level. We also find that regional characteristics do not play a major role in explaining the difference in healthcare-seeking activities. However, the concentration of healthcare resources in a region is found to be correlated with the decision to seek healthcare for certain chronic conditions, suggesting that the role of healthcare resources could differ by chronic condition.


2017年7月24日(月) 16:40-18:10 第21演習室(文科系総合研究棟10階)
いつもと曜日、時刻、会場が異なります.

濱秋純哉 氏 (法政大学)

Title: The effect of inheritance receipt on health: A longitudinal analysis of Japanese young women (abstract)

The current study aims to estimate the causal effect of a wealth shock on individual health, focusing on inheritance receipt. A challenge when examining this causality is to overcome a potential endogeneity of inheritances. To deal with this problem, the novel approach we employed here is to examine the effect of inheritances from respondents' spouse' s parents, instead of respondents' own parents, on the health of respondents themselves. We try to estimate the short-term and long-term impacts of spousal inheritance receipt on the respondents’health. As for the short-term impact, we examine the dynamics of health outcomes during years immediately before and after the inheritance receipt in an event study framework. When assessing the long-term impact, we estimate the effects on health of the cumulative amount of inheritance received from spousal parents by the current survey wave. Our findings are summarized as follows. Starting with the short-term impact, while the asset shock does not affect respondents' mental health, it would improve their self-rated health when the spousal inheritance is not expected beforehand. By contrast, as for the long-term impact, no significant change is found for either type of health measures.


2017年7月27日(木) 16:20-17:50 第401演習室(文科系総合研究棟4階)

荒戸寛樹 氏 (首都大学東京)

Title: A model of negative interest rates (abstract)

This paper builds a simple general equilibrium model which realizes the nominal interest rate on reserve deposit below zero. In this model, banks hold cash and reserve deposits to create lending and credit services. If reserve deposit holdings can create both lending and credit services but cash holdings can create only lending services, the lower bound of the nominal interest rate on reserve deposit can be negative. The lower bound of the reserve rate is endogenous, which depends on the quantity of high-powered money.


2017年8月3日(木) 16:20-17:50 第21演習室(文科系総合研究棟10階)

図斎大 氏 (Temple University)

Title: Distributional stability and equilibrium selection (abstract)

TBA


2017年9月22日(金) 15:00-16:30 大会議室(経済学部棟4階)
いつもと曜日、時間、場所が異なります。応用統計計量ワークショップとの共催

栗田高光 氏 (福岡大学)

Title: Testing parameter constancy in I(2) cointegrated VAR models (abstract)

This paper explores a set of likelihood-based tests for parameter constancy in I(2) cointegrated vector autoregressive (CVAR) models. A new class of test statistics for parameter stability is introduced in the I(2) CVAR framework. This study then proves that their asymptotic distributions are non-standard but free of any nuisance parameters, so it is feasible to approximate the distributions by simulation. Selected quantiles of the approximate distributions are presented as statistical tables for applied use. Monte Carlo experiments are also conducted to investigate empirical finite-sample properties of the stability tests. These experiments provide evidence for the practicality of the proposed tests in applied research on I(2) data.


2017年10月5日(木) 16:20-17:50 第401演習室(文科系総合研究棟4階)

中島賢太郎 氏 (一橋大学)

Title: Identifying Neighborhood Effects among Firms: Evidence from Location Lotteries of the Tokyo Tsukiji Fish Market (abstract)

Firms may benefit from the clustering of neighboring firms with certain characteristics because such clustering allows buyers to reduce their trip and search costs. This idea, known as shopping externality, is central to the theory of the formation of market places and to many branches of the agglomeration theory. A fundamental challenge in investigating such mechanisms arises from economic agents' self-selection into locations. We overcome this challenge by analyzing neighborhood effects among intermediate wholesalers located in the Tokyo Tsukiji Fish Market and by exploiting a unique feature of their shop locations within the market; their locations are determined every 4-10 years by relocation lotteries. First, we confirm that these intermediate wholesalers' shop locations are indeed randomly distributed. Then, we find that the characteristics of the neighboring firms signicantly affect firm performance. Specically, the diversity of the types of neighboring firms as well as the fraction of neighboring firms selling similar products positively affect the performance of small-sized and specialized firms. We find no effect of the characteristics of close neighbors not facing the same corridor and thus not sharing the flow of buyers, which provides evidence that our results are not due to factors other than buyer flow sharing, such as technology spillovers. Our results provide the first randomization-based evidence of shopping externality.


2017年10月19日(木) 16:20-17:50 第401演習室(文科系総合研究棟4階)
Language: English

Chongwoo Choe 氏 (Monash University and ISER, Osaka University)

Title: Competitive Personalized Pricing with Sophisticated Consumers (abstract)

Personalized pricing, a limiting case of price discrimination as the number of targeted consumer segments increases, becomes increasingly common due to the availability of vast amount of individual-level data. This paper studies personalized pricing in a Hotelling setting when each firm has a given target segment and consumers can be sophisticated. Sophisticated consumers can overcome the hurdles for price discrimination and have access to the price offered to non-targeted consumers, which naive consumers cannot. When all consumers are naive, personalized pricing leads to intense competition and total industry profit lower than that under the Hotelling equilibrium. But market is always fully covered. Sophisticated consumers raise the firm's cost of serving non-targeted consumers, hence discourage firms from poaching the rival's targeted customers. This softens competition. When firms have sufficiently large and non-overlapping target segments, consumer sophistication allows firms to extract full surplus from their targeted customers through perfect price discrimination. Consumers are strictly worse-off under competitive personalized pricing, a result in contrast to the common view in the literature. With sophisticated consumers, firms also choose not to serve the entire market when the commonly non-targeted market segment is small. Thus consumer sophistication can lead to lower consumer surplus and lower social welfare. We also discuss the implications for the regulation of the use of customer data by firms.


2017年10月26日(木) 16:20-17:50 第401演習室(文科系総合研究棟4階)

田中隆一 氏 (東京大学)

Title: Do Teachers Matter for Academic Achievement of Students? Evidence from Administrative Panel Data (abstract)

This paper examines empirically the effect of teachers on students' academic outcomes. Using large administrative panel data of reading and math test scores of students in public elementary schools in a municipality in Japan, we estimate the distribution of teacher fixed effects controlling for student, school, and year fixed effects. Our results show that teacher fixed effects are substantial: improvement of teacher fixed effect by one standard deviation raises student's z-score by 0.23 standard deviation for reading and by 0.32 standard deviation for math. Our estimates show that both teacher's experience and class size matter for students' achievement of both reading and math. The magnitude of the teacher effect is equal to the class size effect with reduction of 2.8 students for reading z-score and 5.2 students for math z-score.


2017年11月30日(木) 16:20-17:50 第401演習室(文科系総合研究棟4階)
応用統計計量ワークショップとの共催

大塚芳宏 氏 (東北学院大学)

Title: Measuring spatial correlated volatilities in regional economic data (abstract)

We extend the stochastic volatility model with spatial correlation (Spatially correlated stochastic volatility model-SSV model). We explore the volatility spillover effect in regional economic data using the SSV model with the Markov chain Monte Carlo method. Proposed model is applied for the regional productivities in Japan. Empirical results show that there are high persistences of volatility and spatial correlation in region data. Moreover, volatilities of Hokkaido, Kanto, Chubu near the Tohoku region at the Great East Japan Earthquake are higher than those at the Great recession.




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