Life-cycle Inequality: U.S. vs Europe
Abstract: I document that the mean earnings profile over the life-cycle is steeper in the U.S. than in Europe, while the variance of log earnings and the ratio of 90th to 50th percentile of the earnings distribution show faster growth over the life-cycle in the U.S. I study these differences in labor earnings inequality using a life-cycle model of human capital accumulation and elastic labor supply which features progressive taxation and college choice. Individuals in the model are heterogeneous with respect to their learning ability and initial human capital as well as disutility for college. I then study the role of differences in taxation and higher education policies for shaping the observed differences in inequality across U.S. and Europe. I find that progressive taxation significantly suppresses pre-tax earnings and higher education subsidies increases inequality. Accounting for TFP differences show an important role for differential return to human capital across countries. To fully reconcile the model with data, the role of differences in initial conditions is key.
World Productivity: 1996-2014, joint with Bart Hobijn and John Fernald.
Presented at Society for Economic Dynamics 2019.
Abstract: We account for the sources of world productivity growth, using data for more than 36 industries and 40 major economies from 1996 to 2014, explicitly taking into account changes in the misallocation of resources in labor, capital, and product markets. Productivity growth in advanced economies slowed but emerging markets grew more quickly which kept global productivity growth relatively constant until around 2010. After that, productivity growth in all major regions slowed. Much of the volatility in world productivity growth reflects shifts in the misallocation of labor across countries and industries. Using new data on PPP-based value-added measures by country and industry, we show that about a third of these shifts is due to employment growing in countries, most notably China and India, that benefit from an international cost advantage. Markups are large and rising and impact the imputed misalloction of capital. However, they have little effect on the country-industry technology contribution to global productivity.
Investment in Skills, Managerial Quality and Economic Development
Presented at Midwest Macroeconomics Meeting, Spring 2019.
Abstract: I document that for a group of 38 countries ranging from low to high income: (1) the share of skilled managers is higher in richer countries, (2) the relative income of managers to non-managers is lower in richer countries, and (3) the relative income of skilled to unskilled individuals is lower in richer countries. In addition, the share of managers is lower in richer countries while the mean plant size is larger in richer countries. I explore these facts through the lens of a general equilibrium model of investment in skills and occupational choice. Countries differ in productivity level in production and the level of size-dependent distortions. I find that exogenous productivity differences alone can produce the above facts qualitatively, but size-dependent distortions are needed to account for these facts quantitatively and the output elasticity of productivity is 2.6.
Work in progress
Lifetime Inequality: Empirical Facts Across U.S. and Europe
Normative Growth Accounting: The Distorted-Planner Approach, joint with Bart Hobijn and John Fernald.
Subjective Expectations and Earnings Dynamics in the U.S.
2016- Teaching Mathematics in Seven Countries, 1st Edition. Meraat Educational Innovations Center, Tehran, Iran. (joint with Moharram Naghizadeh and Masoud HajiSeyedHosseiniFard)
This is a translation of a report by the National Center for Education Statistics, from English to Persian. The report is part of the TIMSS 1999 Video Study and consists of video lectures from 8th-grade mathematics classes, which was recorded in 1999, to study best practices in teaching mathematics. The countries in the study are Australia, the Czech Republic, Hong Kong SAR, Japan, the Netherlands, and Switzerland. The statistical analysis in the book provides seven teaching signatures in teaching mathematics and the videos provide actual practices of different teaching signatures. All the video lectures are subtitled in Persian. This book is used as a textbook in official educational degrees for teaching high school mathematics in universities in Iran.
The original book can be downloaded here for FREE.
2015- 70 Educational Indicators in 20 Countries, 3rd Edition. Meraat Educational Innovations Center, Tehran, Iran. (joint with Moharram Naghizadeh)
This is a collection of educational and national level statistics. This book is part of the official teacher education in Iran as a resource for comparative teaching practices.