"Unified China and Divided Europe” with Chiu Yo Ko and Tuan-Hwee Sng, International Economic Review, " Forthcoming.
“Jewish Communities and City Growth in Preindustrial Europe,” with Noel D. Johnson Journal of Development Economics, 2017.
“Jewish Persecutions and Weather Shocks, 1100-1800” with Robert Warren Anderson and Noel Johnson.’ Economic Journal, 2017.
“Taxes, Lawyers, and the Decline of Witchcraft Trials in France” with Noel D. Johnson. Journal of Law and Economics, February 2014.
“Tax Farming and the Origins of State Capacity in England and France” with Noel D. Johnson. Explorations in Economic History 51,1, pp. 1-20 January 2014
“Jewish Emancipation and Schism: Economic Development and Religious Change”, with Jean-Paul Carvalho, Journal of Comparative Economics, Forthcoming.
“The Long Transition from a Natural State to a Liberal Economic Order”, International Review of Law and Economics, Forthcoming
“Monetary Stability and the Rule of Law”, with Blake Johnson, Journal of Financial Stability, vol 17, pp. 46-58, April 2015. 7.
“The Law and Economics of Private Prosecutions in Industrial Revolution England”, Public Choice, vol. 159, issue 1-2, pp. 277-298, April 2014,
“Legal Centralization and the Birth of the Secular State” with Noel D. Johnson. Journal of Comparative Economics, vol. 41, issue 4. November 2013. 11.
“Prosecution Associations in Industrial Revolution England: Private Providers of Public Goods?”, Journal of Legal Studies, vol. 41, issue 1, 2012. 12.
“The Transformation of Labor Supply in the Pre-Industrial World”, Journal of Economic Behavior and Organization, vol. 81, issue 2, pp. 505-523, 2012. 13.
“Evading the Taint of Usury: the Usury Prohibition as a Barrier to Entry”, Explorations in Economic History, vol. 47, issue 4 pp. 420-442, 2010. 14.
“The Political Economy of Expulsion: the Regulation of Jewish Moneylending in Medieval England”, Constitutional Political Economy, vol. 32, issue 4, pp. 374-406, 2010
Professor Koyama maintains a website for Economic History at George Mason here.
July 2017: IEA Roundtable on the Economics of Religion (Cambridge, UK)
June 2017: Law and Economics Workshop (Florence, Italy)
June 2017: SIOE (New York, USA)
May 2017: Economic History Workshop (Northwestern University)
April 2017: Political Theory Project (Brown University)
Here are a few media mentions for my research
The Upshot (NY Times): The Lack of Major Wars May Be Hurting Economic Growth (June 2014)
Slate.com: How Come China Became One Country but Europe Became Lots of Countries? (January 2014)
Foreign Policy: In Medieval Europe, Bad Weather Was Especially Bad for Jews (June 2013)
Times of Israel: Pogroms on Jews linked to cold snaps (March 2013)
Financial Times: Costs of a Cuppa (August 2012)