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Ryoichi Imai Last modified date:2019.06.24

Associate Professor / The International Student Center


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Administration Post
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Homepage
http://japanese-economy.la.coocan.jp/JTWhome.htm
My JTW Course Page .
Academic Degree
Ph.D. in Economics, University of Pennsylvania, United States
Country of degree conferring institution (Overseas)
No
Field of Specialization
Economics
Total Priod of education and research career in the foreign country
00years02months
Outline Activities
Research: We can consider social and economic bilateral relationships such as employment, housing contracts, and marriages, as 'partnerships'. I study the stability of partnerships in the search-theoretic framework, and explore its implications on the macroeconomic and labor market issues.

Teaching: I organaize and manage the JTW program, for which I regularly teach Japanese Economy and the modern history of Japan. I also supervise the Independent Study Projects (ISP) of the JTW students.

Social Contribution: I occasionally participate in some policy research groups funded by the goverenmnt.
Research
Research Interests
  • Economics of Resale
    keyword : industrial organization, real estate market, used good market, durable goods, middlemen
    2012.04~2021.03Economic Analysis of Labor Market Institutions.
  • law and economics
    keyword : regulation, labor law, intellectual property rights, patents, corporate laws
    2010.10~2021.03Economic Analysis of Labor Market Institutions.
  • Historical and Theoretical Analysis of Monetaty Economy
    keyword : money, financial instituition, premodern society, history
    2010.10~2021.03Economic Analysis of Labor Market Institutions.
  • Economic Analysis of the Labor Market Policy
    keyword : unemployment insurance, employment protection regulation, minimum wage
    2007.04Economic Analysis of Labor Market Institutions.
  • Macroeconomics
    keyword : macroeconomics, monetary policy, fiscal policy
    2002.09We can see partnerships in various economic activities such as employment, housing contracts, and marriages, etc. I explore the stability of partnerships in the search-theoretic framework..
Current and Past Project
  • We explore the bilateral trading machanism in decentralized markerts, and consider applications of the mechanism to labor markets, housing markets, and industrial organizations.
  • Trading mechanisms of bilateral trades in decentralized markerts are explored based on the recent developments of the game theory, bargaining theory, and auction theory. We apply the framework to the understanding of labor markets, theory of money, and industrial organizations.
  • Law and Economics of the Labor Market Policies
  • Employment Protection in the perspective of Law and Economics
  • Trading mechanisms of bilateral trades in decentralized markerts are explored based on the recent developments of the game theory, bargaining theory, and auction theory. We apply the framework to the understanding of labor markets, theory of money, and industrial organizations.
  • The Non-Walrasian mechanisms of price determinations are widely observed in the labor, housing, and money markets. We will provide some plausible frameworks to anlayze the decetralized transactions in these markets.
Academic Activities
Books
1. Law and Economics of Employment Protection Legislation.
2. Search Theory: The Economics of Decentralized Trade.
3. Employment Protection Legislation.
4. "Education, Unemployment, and On-the-Job Search" in Osumi and Hori (ed.) Regional Economy and Public Policies under the Grobalization, volume II, Kyushu University Press, 2004..
Reports
1. , [URL].
2. , [URL].
Papers
1. Secular Stagnation and the Neo-Fisher Policy, [URL].
2. Ryoichi Imai, Payroll Tax Reform and Job Distribution, 九州大学留学生センター紀要, 26, 61-76, 2018.03, [URL], Taxation on employment is explored in a labor search model with two types of jobs of different productivity and on-the-job search. The highproductive job is charged with both payroll and income taxes, while the low-productive jobs with income tax only. A tax reform to reduce payroll tax and raise income tax shifts the steady-state equilibrium distribution of jobs toward less productive ones. The result stands in a sharp contrast to the usual argument that replacement of payroll tax with income tax creates more of high-productive jobs..
3. Does public insurance raise the price of medical care?, [URL].
4. On the Search-Theoretic Anaylis of Housing Markets.
5. Abenomics Reconsidered, [URL].
6. Ryoichi Imai, Stagnation and Technological Progress, 九州大学留学生センター紀要, 22, 25-35, 2015.03, [URL], I present a simple model to illustrate the mechanism that technological progress might cause apparent stagnation, while it obviously improves economic welfare. TFP growth in the anufacturing sector induces employment and output to shift to the service sector if the elasticity of substitution in preference is small. Then GDP stagnates while welfare increases..
7. Ryoichi Imai, Middlemen and Resale, Search Theory Conferenceで報告。, 2012.03, [URL].
8. Ryoichi Imai, A Search Model of Bestsellers, Search Theory Workshop (Osaka), 九州大学で報告。, 2011.02, [URL].
9. Ryoichi Imai, A Search Model of the Resale Market, Search Theory Workshop (Osaka and New York), Workshop on Macroeconomic Dynamics, Free University of Amsterdam, 東京大学で報告。, 2010.07, [URL].
10. Kenneth Burdett, Ryoichi Imai, and Randall Wright, "Unstable Relationships", Frontiers of Macroeconomics, 1(1), 1-42., 2004.01.
11. Ryoichi Imai, "Some Coordination Games Which Have a Unique Equilibrium", NUCB Journal of Economics and Management, 45(2), 107-114, 2001.03.
12. Ryoichi Imai, "Growth and Unemployment in a Search-Theoretic Model of Money", NUCB Journal of Economics and Management, 44(1), 135-156, 1999.07.
Presentations
1. Ryoichi Imai, Tax Wedge and Job Distribution with Directed Search, Search and Matching Theory Workshop 2018 Fukuoka Japan, 2018.03, [URL], In a model with two types (good and bad) of jobs and directed search, the effect of taxation is explored. If both the sectors are taxed at an uniform rate, the policy is irrelevant for the distribution of good jobs and bad jobs, or the welfare distribution between workers and firms. If the bad sector is taxed at a lower pyaroll tax rate, and the payroll tax is gradually replaced by the income tax in the good sector, .
2. Ryoichi Imai, Resale with multiple inventory, Singapore Search and Matching Workshop, 2014.05, [URL], I present a model of the resale market in which middlemen hold multiple
inventory. In the economy, there are a new good market and a resale market.
Trades in the resale market is mediated by middlemen. There are two sides
of the resale market. In the buy side, trades are frictionless in the sense that
consumers can imediately sell their used goods to middlemen, which is the
gain to use the resale market. In the sell side, however, trades are frictional
in the sense that meddlemen match demand to supply between buyers and
sellers. I show that resale provides liquidity to the economy, and improves
the welfere of consumers as well as the prots of the new good supplier..
3. Middlemen and Resale, [URL].
4. A Search Model of the Resale Market, [URL].
5. A Search Model of Bestsellers, [URL].
6. A Search Model of the Resale Market, [URL].
7. A Search Model of the Resale Market.
8. A Search Model of the Resale Market.
9. Fiscal Policies in a Competitive Search Model.
10. A Search Model of the Lost Generation, [URL].
11. Payroll Tax Reform and Job Distribution, [URL].
12. Debt Overhang and Job Destruction .
Educational
Educational Activities
The Japanese Economy, Microeconomics, Macroeconomics, Labor Economics, Monetary Economics
Social
Professional and Outreach Activities
Labor Market Research Committee, Institute for Statistics Research.