Joan Llull

Assistant Professor of Economics
Universitat Autònoma de Barcelona, MOVE, and Barcelona GSE


Google Scholar Citations

Published papers

"Immigration, Wages, and Education: A Labor Market Equilibrium Structural Model"
Review of Economic Studies, Published online before print.
Online suplement [pdf].
Code and data [zip].

Recent literature analysing wage effects of immigration assumes labour supply is fixed across education-experience cells. This article departs from this assumption estimating a labour market equilibrium dynamic discrete choice model on U.S. micro-data for 1967–2007. Individuals adjust to immigration by changing education, participation, and/or occupation. Adjustments are heterogeneous: 4.2–26.2% of prime-aged native males change their careers; of them, some switch to white-collar careers and increase education by about three years; others reduce labour market attachment and reduce education also by about three years. These adjustments mitigate initial effects on wages and inequality. Natives that are more similar to immigrants are the most affected on impact, but also have a larger margin to adjust and differentiate. Adjustments also produce a self-selection bias in the estimation of wage effects at the lower tail of the distribution, which the model corrects.

"The Effect of Immigration on Wages: Exploiting Exogenous Variation at the National Level"
Journal of Human Resources, 53(3), 608–622, Summer 2018.
PDF version [pdf].
A post on this article appeared in the Barcelona GSE Focus blog.

I estimate the effect of immigration on wages of native male workers correcting for endogenous allocation of immigrants across education-experience cells. Exogenous variation is obtained from interactions of push factors, distance, and skill-cell dummies: distance mitigates the effect of push factors more severely for some skill groups. I propose a two-stage approach (Sub-Sample 2SLS) that estimates the first stage regression with an augmented sample of destination countries, and the second stage with a restricted sub-sample of interest. Asymptotic properties are discussed. Results show important OLS biases. For U.S. and Canada, Sub-Sample 2SLS elasticities average around minus one, very stable across alternative specifications and different instruments.

"Marriage and Health: Selection, Protection, and Assortative Mating", with Nezih Guner and Yuliya A. Kulikova
European Economic Review, 104, 138–166, May 2018.
Code and data [zip].
Previously circulated under the title "Does Marriage Make You Healthier?"
This paper was elected one of the eight finalists of the La Vanguardia Science Award and also received wide media coverage.
Posts on the article appeared in The Economist, VOXeu, Barcelona GSE Focus, and Nada es Gratis.

Using data from the Panel Study of Income Dynamics (PSID) and the Medical Expenditure Panel Survey (MEPS), we analyze the health gap between married and unmarried individuals of working-age. Controlling for observables, we find a gap that peaks at 10 percentage points at ages 55-59. If we allow for unobserved heterogeneity in innate health (permanent and age-dependent), potentially correlated with timing and likelihood of marriage, we find that the effect of marriage on health disappears below age 40, while about 5 percentage points difference between married and unmarried individuals remains at older (55–59) ages. This indicates that the observed gap is mainly driven by selection into marriage at younger ages, but there might be a protective effect of marriage at older ages. Exploring the mechanisms behind this result, we find that better innate health is associated with a higher probability of marriage and a lower probability of divorce, and there is strong assortative mating among couples by innate health. We also find that married individuals are more likely to have a healthier behavior compared to unmarried ones. Finally, we find that health insurance is critical for the beneficial effect of marriage.

"Understanding International Migration: Evidence from a New Dataset of Bilateral Stocks (1960-2000)"
SERIEs—The Journal of the Spanish Economic Association, 7(2), 221–255, June 2016.
Code and data [zip].

In this paper I present a new database of bilateral migrant stocks and I provide new evidence on the determinants of international migration. The new Census-based data are obtained from National Statistical Offices of 24 OECD countries, and they cover the total stock of immigrants in each destination country for 1960–2000, including 188 countries of origin, sometimes in grouped categories. For each census, I keep grouped categories in a raw manner, without making imputations to specific origin countries. In the empirical analysis, I give an explicit treatment to these grouped categories. Results present strong evidence of heterogeneous effects of income gains on migration prospects depending on distance. For example, a 1000$ increase in US income per capita increases the stock of Mexican immigrants in the country by a percentage 2.6 times larger than the percentage increase in the stock of Chinese (8 vs. 3.1%).

Working papers

"Internal Migration in Dual Labor Markets", with Robert A. Miller
Work in progress, current version December 2016.
PDF version [pdf].

This paper uses a large panel assembled from Spanish administrative data for over one million individuals assembled from tax, welfare and employment records over a period spanning 30 years to estimate a dynamic model of individual optimization that explains transitions and spell lengths between permanent positions, temporary positions, unemployment and exits from the workforce. We seek to explain the sequence of job spells in temporary contracts and unemployment transitions as new entrants in the workforce gradually acquire experience and, ultimately, transition into permanent contracts. The career mobility of young workers is jointly determined with geographical and occupational mobility. Thus we investigate how different types of labor market experience and welfare entitlements affect job search behavior, employment duration, and migration patterns over the life cycle.

"Expectations, Satisfaction, and Utility from Experience Goods: A Field Experiment in Theaters", with Pedro Rey-Biel, Ayelet Gneezy, and Uri Gneezy
Barcelona GSE Working Paper 944, November 2016.
PDF version [pdf].
A post on this article appeared in the Barcelona GSE Focus blog.

Understanding what affects satisfaction from consumption is fundamental to studying economic behavior. However, measuring subjective hedonic experiences is not trivial, in particular when studying experience goods in which quality is difficult to observe prior to consumption. We report the results of a field experiment with a theater show in which the audience pays at the end of the show under pay-what-you-want pricing. Using questionnaires, we measure expected enjoyment before the show, as well as the realized enjoyment after. Correlating the amounts paid with the expected and realized enjoyment, we find that individuals with a larger gap between reported expectations and enjoyment pay significantly more. Once we account for the satisfaction gap, the level of expected enjoyment or realized enjoyment has no significant effect in predicting payments.

Old research papers

"Reconciling Spatial Correlations and Factor Proportions: A Cross-Country Analysis of the Economic Consequences of Immigration"
Last version, June 2011.
PDF version [pdf].
Previously circulated under the title "The Impact of Immigration on Productivity", CEMFI working paper 0802.

This paper contributes to the literature of the economic consequences of immigration using cross-country data from a new bilateral dataset on international migrant stocks based on the one presented in Llull (2011). The paper identifies the effect of immigration on wages —proxied by GDP per capita— and employment prospects —employment rate, hours worked, and unemployment rate— estimating a "national level spatial correlation" from 24 OECD countries over the period 1960 to 2005. Endogeneity of immigration is instrumented by push-targeting interactions: the interaction of a push factor, which motivates migration from a country (war, political environment, and demographic and economic factors), with a geography-based targeting or bilateral factor, which determines the destination country of those migrants (distance). For example, a war in Algeria is going to push more immigrants to France than to Australia. The main result is that, contrary to the cross-city estimates in the literature, the national level spatial correlation is sizeable, implying important negative elasticities for income and employment with respect to immigration.

"Skilled migration and growth. Testing brain drain and brain gain theories" with José L. Groizard
DEA Working Papers n 20, Universitat de les Illes Balears. Last version, October 2007.
PDF version [pdf].
Previously circulated under the title "Brain Drain or Brain Gain? New Empirical Evidence".

Traditional models of brain drain stress its negative impact on the welfare and growth of sending economies, while new models introduce the possibility of brain gain through several channels (human capital, remittances, return migration or FDI and trade linkages). We test all these theories by estimating cross-country individual regressions for each channel, and a system of equations to assess the overall effect of brain drain on economic growth. Results suggest a negative effect on human capital stock, negligible on remittances (controlling for total migration) and a positive effect on trade and FDI. The net impact of skilled migration on economic growth remains ambiguous.