Microeconomics & International Trade Seminars

Thursdays, 1:40 - 3:00 PM
via Zoom

Spring 2020

April 2
Edward "Ted" Miguel, UC Berkeley
"Twenty Year Economic Impacts of Deworming"
Host: Ajay Shenoy
This study exploits a randomized school health intervention that provided deworming treatment to Kenyan children and utilizes longitudinal data to estimate impacts on economic outcomes up to 20 years later. The effective respondent tracking rate was 84%. Individuals who received 2 to 3 additional years of childhood deworming experience an increase of 14% in consumption expenditure, 18% in hourly earnings, 8% in non-agricultural work, and are 9% more likely to live in urban areas. Most effects are concentrated among males. Given deworming's low cost, a conservative annualized social internal rate of return estimate is 37%.
Join Zoom Meeting
Meeting ID: 179 546 935

April 23
Claudio Ferraz, Vancouver School of Economics, UBC
"Internet, Social Media, and the Behavior of Politicians: Evidence from Facebook in Brazil"
Host: Ajay Shenoy
Recent years have witnessed the remarkable diffusion of social media in tandem with the spread of mobile phones that are, in many places, the key tool for accessing those media. We ask whether this has affected the communication and responsiveness of politicians towards voters. Using data on the spread of the 3G mobile phone network in Brazil, and selfcollected data on the universe of Facebook activities by federal legislators, we examine how legislators respond when municipalities that are part of their electoral base obtain access to the 3G technology. We find that politicians increase their online engagement with voters that gain 3G mobile access but decrease their offline engagement measured by speeches and earmarked transfers towards connected localities where they have a large pre-existing vote share. Our results suggest that instead of increasing responsiveness, social media may enable politicians to solidify their position with core supporters using communication strategies while shifting resources away towards localities that lack 3G internet access.
Join Zoom Meeting
Meeting ID: 926 4874 8689

April 30
Vittorio Bassi, USC
"Achieving Scale Collectvely"
Host: Brenda Samaniego
Technology is often embodied in indivisible capital goods, such as production machines. As a result, the small scale of firms in developing countries could hinder investment and productivity. This paper finds that this concern is less important than previously thought. We design and implement a novel survey to measure production processes in over 1,000 manufacturing firms in three prominent sectors in urban Uganda. We document that in carpentry – a sector with small firms and high fixed costs – an active inter-firm rental market for machines has emerged, allowing firms to collectively achieve economies of scale. Interpreted through the lenses of an equilibrium model of firm behavior, our data reveal that the existing rental market limits by 55% the productivity losses due to the small scale of production of individual firms. Our results imply that the design of effective development policies should take into account market-level interactions between firms as a powerful means to foster technology adoption and mitigate the costs of small scale.

May 28 -- Postponed to a later date
Severin Borenstein, UC Berkeley
Host: Natalia Lazzati

Fall 2019

September 26
Daniel Chen, Toulouse School of Economics
"Stereotypes in High Stake Decisions: Evidence from U.S. Circuit Courts"
Host: Dan Friedman
Attitudes towards social groups such as women and racial minorities have been shown to be important determinants of individual’s decisions but are hard to measure for those in policymaking roles. We propose a way to address the challenge in the case of U.S. appellate court judges, for whom we have large corpora of written text (their published opinions). Using the universe of published opinions in U.S. Circuit Courts 1890-2013, we construct a judge-specific measure of gender-stereotyped language (gender slant) by looking at the relative co-occurrence of words identifying gender (male versus female) and words identifying gender stereotypes (career versus family). We find that female and younger judges tend to use less stereotyped language in their opinions. Our measure of gender slant matters for judicial decisions: judges with higher slant vote more conservatively on women rights’ issues. In addition, lexically slanted judges influence workplace outcomes for female judges: more slanted judges are less likely to assign opinions to female judges, cite fewer female-authored opinions and are more likely to reverse lower-court decisions if the district court judge is a woman. Our results expose a possible use of lexical slant to detect decision-makers’ stereotypes that predict behavior and disparate outcomes.

October 10
Frank Wolak, Stanford
"Fast, 'Robust', and Approximately Correct: Estimating Mixed Demand Systems"
Host: Jessie Li
Many econometric models used in applied work integrate over unobserved heterogeneity. We show that a class of these models that includes many random coefficients demand systems can be approximated by a “small-o" expansion that yields a linear two-stage least squares estimator. We study in detail the models of product market shares and prices popular in empirical IO. Our estimator is only approximately correct, but it performs very well in practice. It is extremely fast and easy to implement, and it is “robust" to changes in the higher moments of the distribution of the random coefficients. At the very least, it provides excellent starting values for more commonly used estimators of these models.

October 15 (Note different day)
Aaron Bodoh-Creed, Berkeley Haas
"Pre-College Human Capital Investment and Affirmative Action: A Structural Policy Analysis of U.S. College Admissions"
Host: Natalia Lazzati
We estimate a model of college admissions wherein students endogenously accrue pre-college human capital (HC) as part of a contest for enrollment at high quality colleges. We use methods from the empirical auctions literature to separately identify the roles of school quality, HC, and students’ privately known learning costs on post-college household income. Conditional on graduating, college quality is the most important factor in determining income, while unobserved student characteristics play a nontrivial secondary role. Pre-college HC drives college placement and graduation probability, but not post-college income. We conduct counterfactual experiments comparing the status quo to a color-blind admissions rule and a proportional quota for minority students. Color-blind admissions results in fewer (more) minority students enrolling at the best (worst) schools with a corresponding reduction in household incomes and graduation rates. The signs and magnitudes of changes to HC investment and graduation rate depend on the learning cost of the particular student in question, and accounting for the endogeneity of HC is crucial for predicting the effect of each admissions rule.

November 14 (moved from Nov 13 Brown Bag)
David Schonholzer, Stockholm University
"Measuring the Efficacy and Efficiency of School Faculty Expenditures"
Host: Ajay Shenoy
We offer new evidence on the effects and efficiency of school facility investment on student and neighborhood outcomes, linking data on new facility openings to administrative student and real estate records in Los Angeles Unified School District (LAUSD). Since 1997, LAUSD has built and renovated hundreds of schools as a part of the largest public school construction program in US history. Using an event study design that exploits quasi-random variation in the timing of new facilities and a residential assignment instrument, we find strong positive impacts on math, English, and attendance. Effects are not driven by changes in class size, peers, teachers, or principals, but rather by increased facility quality and, to a lesser extent, reductions in overcrowding. House prices increase by 6% in neighborhoods that receive new schools. Using a residential choice model, we then estimate that a dollar spent on school facilities raises the sum of housing values and adult earnings by 1.64 dollars, with only 22% of this valuation due to academic benefits of the program. The housing market valuation of academic benefits captures most but not all of the implied future earnings gains.

November 21
Paul Niehaus, UC San Diego
"General Equilibrium Effects of Cash Transfers: Experimental Evidence from Kenya"
Host: Alan Spearot
Tracing out the effect of large economic stimuli on the pattern of transactions in an integrated economy, and their aggregate implications, has long been a central goal of economic analysis, but until now has not been studied experimentally. This study was designed to study the aggregate consequences of cash transfer programs while accounting for multipliers and externalities. We carried out a large-scale experiment in rural Kenya that provided one-time cash transfers worth roughly USD 1000 across 653 villages with around 280,000 people, with a large implied fiscal shock of roughly 15% of local GDP, and deliberately randomized the intensity of cash transfers across geographic sublocations. We first document large direct impacts on households that received transfers, including increases in consumption expenditures and durable assets 18 months after transfers. Enterprises in areas that receive more cash transfers also experience meaningful gains in total revenues, in line with the increased household expenditures. Untreated households, too, show large consumption expenditure gains, by an amount comparable to recipients' gains. Through monthly measurement of scores of commodities and consumer and durable goods, we document positive but minimal local price inflation (0.1% on average) in areas that received additional cash. To assess aggregate implications, we compute a local fiscal multiplier, taking advantage of data on representative samples of treated and untreated households and firms. Both income data and consumption data yield large positive estimated local fiscal multipliers of approximately 2.6. A speculative possibility for how local output increases, despite no meaningful local price inflation or firm investment response, is that many local enterprises are characterized by substantial `slack' in their utilization of factors of production. Finally, we interpret the welfare implications of these results through the lens of a simple household optimization framework. In this framework, the fact observed consumption gains for untreated households are not driven by corresponding increases in labor supply, combined with a lack of local price inflation or of adverse spillovers along other non-market dimensions, suggest that non-recipients as well as recipients were made better off in this setting. This in turn suggests that some existing evaluations of cash transfer programs that ignore aggregate effects may be under-estimating overall program gains. 

December 5
Jean-Jacques Forneron, Boston University
"Inference by Stochastic Optimization: A Free-Lunch Bootstrap"
Host: Jessie Li
This paper proposes a Stochastic Newton-Raphson (SNR) algorithm which delivers asymptotically valid Bootstrap draws and point estimates in a single run. This algorithm generates draws that take the form of a Markov-Chain generated by the gradient and hessian computed on batches of data that are re-sampled at each iteration. We show that these draws yield both accurate estimates and asymptotically valid frequentist inferences. This is particularly attractive in settings where the model needs to be re-estimated many times to compute standard errors. SNR performs well in simulations. Furthermore, a simple modification of the baseline algorithm produces graphically appealing synopses of data irregularities. Sensitivity of the estimates to outliers are illustrated in several applications.

Winter 2020

January 16
Na'ama Shenhav, Dartmouth
"Long-Run Effects of Incentivizing Work Post-Birth"
Host: George Bulman
This paper provides new evidence of the impact of increasing work incentives post-birth on mothers’ long-run career trajectories. To identify these effects, we focus on the impact of the substantial expansion of the Earned Income Tax Credit (EITC) in 1994, and use two complementary research designs that exploit variation in the timing of exposure to the expansion as well as in eligibility for the credit. Using a large-scale panel of administrative earnings linked to the CPS, we show that mothers exposed to the expansion immediately after birth (“early-exposed”) have 4 to 5 p.p. higher labor force participation in first 5 years after birth than mothers exposed 3 to 6 years after a first birth (“late-exposed”). Fifteen years later, we find that early-exposed moms have the same labor force participation as late-exposed moms, but have accrued 0.6 to 0.8 more years of work experience and 8 percent higher earnings. These impacts on labor market outcomes have important fiscal externalities: early exposed moms are expected to receive higher EITC benefits in the short-term, but lower EITC benefits over the long run. Our results suggest that there are steep returns to work incentives at child birth that accumulate over the life-cycle.

January 23
Shelly Lundberg, UC Santa Barbara
"Vulnerable Boys: Short-term and Long-tern Gender Differences in the Impacts of Adolescent Disadvantage"
Host: Rob Fairlie
The growing gender gap in educational attainment between men and women has raised concerns that the skill development of boys may be more sensitive to family disadvantage than that of girls.  Using the National Longitudinal Study of Adolescent to Adult Health (Add Health) we find, as do previous studies, that boys are more likely, relative to girls, to experience increased problems in school, including suspensions and reduced educational aspirations, when they are in poor quality schools, less-educated neighborhoods, and father-absent households. Following these cohorts into young adulthood, however, we find no evidence that adolescent disadvantage has stronger negative impacts on long-run economic outcomes such as college graduation, employment, or income for men, relative to women. We do find that father absence is more strongly associated with men’s marriage and childbearing and also weak support for greater male vulnerability to disadvantage in rates of high school graduation. An investigation of adult outcomes for another recent cohort from the National Longitudinal Survey of Youth, 1997 produces a similar pattern of results. We conclude that focusing on gender differences in behavior in school may not lead to valid inferences about the effects of disadvantage on adult skills.

February 6
Amanda Agan, Rutgers
"Salary History and Hiring: Field Experimental Evidence from a Two-Sided Audit Study"
Host: Jeremy West
What is the effect of job candidates disclosing their wage history on callbacks and salary offers? If these effects differ by a job candidate's gender or the amount they disclose, then disclosure might also impact inequality in the labor market. We implement a field experimental design we call a two-sided audit study, in which recruiters evaluate job applications with randomized characteristics under randomly assigned salary disclosure conditions. We begin by estimating the effects of candidates' salary disclosure on outcomes such as callbacks and salary offers. Then, we combine our estimates to examine the likely effect of recent laws that ban employers from asking candidates for their salary history like those passed in Massachusetts, California, New York City, and Chicago on wage inequality.

February 13
Simon Jaeger, MIT
"Labor in the Boardroom"
Host: Laura Giuliano
We estimate the effects of a mandate allocating a third of corporate board seats to workers (shared governance). We study a reform in Germany that abruptly abolished this mandate for certain firms incorporated after August 1994 but locked it in for the older cohorts. In sharp contrast to the canonical hold-up hypothesis – that increasing labor’s power reduces owners’ capital investment – we find that granting formal control rights to workers raises capital formation. The capital stock, the capital-labor ratio, and the capital share all increase. Shared governance does not raise wage premia or rent sharing. It lowers outsourcing, while moderately shifting employment to skilled labor. Shared governance has no clear effect on profitability, leverage, or costs of debt. Overall, the evidence is consistent with richer models of industrial relations whereby shared governance raises capital by permitting workers to bargain over investment or by institutionalizing communication and repeated interactions between labor and capital.

February 20
Daniel Bennett, USC
"Adverse Selection in the Marriage Market: HIV Testing and Marriage in Rural Malawi"
Host: Jon Robinson
Asymmetric information in the marriage market may cause adverse selection and delay marriage if partner quality is revealed over time. Sexual safety is an important but hidden partner attribute, especially in areas where HIV is endemic. A model of positive assortative matching with both observable (attractiveness) and hidden (sexual safety) attributes predicts that removing the asymmetric information about sexual safety accelerates marriage and pregnancy for safe respondents, and more so if they are also attractive. Frequent HIV testing may enable safe people to signal and screen. Consistent with these predictions, we show that a high-frequency, “opt-out” HIV testing intervention changed beliefs about partner’s safety and accelerated marriage and pregnancy, increasing the probabilities of marriage and pregnancy by 26 and 27 percent for baseline-unmarried women over 28 months. Estimates are larger for safe and attractive respondents. Conversely, a single-test intervention lacks these effects, consistent with other HIV testing evaluations in the literature. Our findings suggest that an endogenous response to HIV risk may explain why the HIV/AIDS epidemic has coincided with systematic marriage and pregnancy delays.