February 11, 2019 ,New This Week: The Latest NBER Working Papers

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1.	Synthetic Difference In Differences Dmitry Arkhangelsky, Susan Athey, David A. Hirshberg, Guido W. Imbens, and Stefan Wager #25532 Abstract: We present a new perspective on the Synthetic Control (SC) method as a weighted least squares regression estimator with time fixed effects and unit weights. This perspective suggests a generalization with two way (both unit and time) fixed effects, and both unit and time weights, which can be interpreted as a unit and time weighted version of the standard Difference In Differences (DID) estimator. We find that this new Synthetic Difference In Differences (SDID) estimator has attractive properties compared to the SC and DID estimators. Formally we show that our approach has double robustness properties: the SDID estimator is consistent under a wide variety of weighting schemes given a well-specified fixed effects model, and SDID is consistent with appropriately penalized SC weights when the basic fixed effects model is misspecified and instead the true data generating process involves a more general low-rank structure (e.g., a latent factor model). We also present results that justify standard inference based on weighted DID regression. Further generalizations include unit and time weighted factor models.
2.	A Panel-based Proxy for Gun Prevalence in the US Daniel Cerqueira, Danilo Santa Cruz Coelho, John J. Donohue, Marcelo Fernandes, and Jony Arrais Pinto Jr. #25530 Abstract: There is a consensus that the proportion of suicides committed with a firearm is the best proxy for gun ownership prevalence. Cerqueira et al. (2108) exploit the socioeconomic characteristics of suicide victims in order to develop a new and more refined proxy. It is based on the fixed effects of the victim's place of residence estimated from a discrete choice model for the likelihood of committing suicide with gun. We empirically assess this new indicator using gun ownership data from the Behavioral Risk Factor Surveillance System (BRFSS) and suicide registers of the US National Center for Health Statistics (NCHS) from 1995 through 2004. We demonstrate that this new gun proxy provides significant gains in correlation with the percentage of households with firearms.
3.	Estimating the Economic Impacts of Climate Change Using Weather Observations Charles D. Kolstad and Frances C. Moore #25537 Abstract: This paper reviews methods that have been used to statistically measure the effect of climate on economic value, using historic data on weather, climate, economic activity and other variables. This has been an active area of research for several decades, with many recent developments and discussion of the best way of measuring climate damages. The paper begins with a conceptual framework covering issues relevant to estimating the costs of climate change impacts. It then considers several approaches to econometrically estimate impacts that have been proposed in the literature: cross-sections, linear and non-linear panel methods, long-differences, and partitioning variation. For each method we describe the kind of impacts (short-run vs long-run) estimated, the type of weather or climate variation used, and the pros and cons of the approach.
4.	Narratives about Technology-Induced Job Degradations Then and Now Robert J. Shiller #25536 Abstract: Concerns that technological progress degrades job opportunities have been expressed over much of the last two centuries by both professional economists and the general public. These concerns can be seen in narratives both in scholarly publications and in the news media. Part of the expressed concern about jobs has been about the potential for increased economic inequality. But another part of the concern has been about a perceived decline in job quality in terms of its effects on monotony vs creativity of work, individual sense of identity, power to act independently, and meaning of life. Public policy should take account of both of these concerns, inequality and job quality.
5.	Tax Policy and Local Labor Market Behavior Daniel G. Garrett, Eric C. Ohrn, and Juan Carlos Suárez Serrato #25546 Abstract: Since 2002, the US government has encouraged business investment using accelerated depreciation policies that significantly reduce investment costs. We provide the first in-depth analysis of this stimulus on employment and earnings. Our local labor markets approach exploits cross-industry differences in policy generosity interacted with county-level variation in industry concentration. Places that experience larger decreases in investment costs see a level increase in employment that implies a $53,000 cost-per-job. We find no positive effects on average earnings. In contrast, we document a persistent growth in capital. These results imply a capital-labor substitution elasticity that grows over time and can exceed unity.
6.	Ten Years after the Financial Crisis: What Have We Learned from the Renaissance in Fiscal Research? Valerie A. Ramey #25531 Abstract: This paper takes stock of what we have learned from the “Renaissance” in fiscal research in the ten years since the financial crisis. I first summarize the new innovations in methodology and discuss the various strengths and weaknesses of the main approaches. Reviewing the estimates, I come to the surprising conclusion that the bulk of the estimates for average spending and tax change multipliers lie in a fairly narrow range, 0.6 to 1 for spending multipliers and -2 to -3 for tax change multipliers. However, I identify economic circumstances in which multipliers lie outside those ranges. I conclude by reviewing the debate on whether multipliers were higher on the stimulus spending in the U.S. and the fiscal consolidations in Europe.
7.	Judging Judge Fixed Effects Brigham R. Frandsen, Lars J. Lefgren, and Emily C. Leslie #25528 Abstract: We propose a test for the identifying assumptions invoked in designs based on random assignment to one of many "judges.'' We show that standard identifying assumptions imply that the conditional expectation of the outcome given judge assignment is a continuous function with bounded slope of the judge propensity to treat. The implication leads to a two-part test that generalizes the Sargan-Hansen overidentification test and assesses whether implied treatment effects across the range of judge propensities are possible given the domain of the outcome. We show the asymptotic validity of the testing procedure, demonstrate its finite-sample performance in simulations, and apply the test in an empirical setting examining the effects of pre-trial release on defendant outcomes in Miami. When the assumptions are not satisfied, we propose a weaker average monotonicity assumption under which IV still converges to a proper weighted average of treatment effects.
8.	Universal Basic Income in the US and Advanced Countries Hilary W. Hoynes and Jesse Rothstein #25538 Abstract: We discuss the potential role of Universal Basic Incomes (UBIs) in advanced countries. A feature of advanced economies that distinguishes them from developing countries is the existence of well developed, if often incomplete, safety nets. We develop a framework for describing transfer programs, flexible enough to encompass most existing programs as well as UBIs, and use this framework to compare various UBIs to the existing constellation of programs in the United States. A UBI would direct much larger shares of transfers to childless, non-elderly, non-disabled households than existing programs, and much more to middle-income rather than poor households. A UBI large enough to increase transfers to low-income families would be enormously expensive. We review the labor supply literature for evidence on the likely impacts of a UBI. We argue that the ongoing UBI pilot studies will do little to resolve the major outstanding questions.
9.	We are all Behavioral, More or Less: Measuring and Using Consumer-level Behavioral Sufficient Statistics Victor Stango and Jonathan Zinman #25540 Abstract: Can a behavioral sufficient statistic empirically capture cross-consumer variation in behavioral tendencies and help identify whether behavioral biases, taken together, are linked to material consumer welfare losses? Our answer is yes. We construct simple consumer-level behavioral sufficient statistics—“B-counts”—by eliciting seventeen potential sources of behavioral biases per person, in a nationally representative panel, in two separate rounds nearly three years apart. B-counts aggregate information on behavioral biases within-person. Nearly all consumers exhibit multiple biases, in patterns assumed by behavioral sufficient statistic models (a la Chetty), and with substantial variation across people. B-counts are stable within-consumer over time, and that stability helps to address measurement error when using B-counts to model the relationship between biases, decision utility, and experienced utility. Conditional on classical inputs—risk aversion and patience, life-cycle factors and other demographics, cognitive and non-cognitive skills, and financial resources—B-counts strongly negatively correlate with both objective and subjective aspects of experienced utility. The results hold in much lower-dimensional models employing “Sparsity B-counts” based on bias subsets (a la Gabaix) and/or fewer covariates, illuminating lower-cost ways to use behavioral sufficient statistics to help capture the combined influence of multiple behavioral biases for a wide range of research questions and applications.

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10.	Born in the Family: Preferences for Boys and the Gender Gap in Math Gaia Dossi, David N. Figlio, Paola Giuliano, and Paola Sapienza #25535 Abstract: We study the correlation between parental gender attitudes and the performance in mathematics of girls using two different approaches and data. First, we identify families with a preference for boys by using fertility stopping rules in a population of households whose children attend public schools in Florida. Girls growing up in a boy-biased family score 3 percentage points lower on math tests when compared to girls raised in other families. Second, we find similar strong effects when we study the correlations between girls’ performance in mathematics and maternal gender role attitudes, using evidence from the National Longitudinal Survey of Youth. We conclude that socialization at home can explain a non-trivial part of the observed gender disparities in mathematics performance and document that maternal gender attitudes correlate with those of their children, supporting the hypothesis that preferences transmitted through the family impact children behavior.
11.	Strict ID Laws Don't Stop Voters: Evidence from a U.S. Nationwide Panel, 2008–2016 Enrico Cantoni and Vincent Pons #25522 Abstract: U.S. states increasingly require identification to vote – an ostensive attempt to deter fraud that prompts complaints of selective disenfranchisement. Using a difference-in-differences design on a 1.3-billion-observations panel, we find the laws have no negative effect on registration or turnout, overall or for any group defined by race, gender, age, or party affiliation. These results hold through a large number of specifications and cannot be attributed to mobilization against the laws, measured by campaign contributions and self-reported political engagement. ID requirements have no effect on fraud either – actual or perceived. Overall, our results suggest that efforts to reform voter ID laws may not have much impact on elections.
12.	Fully Closed: Individual Responses to Realized Gains and Losses Steffen Meyer and Michaela Pagel #25542 Abstract: We use transaction-level data of portfolio trades and holdings linked to checking, savings, and settlement account transactions and balances to explore how individuals respond to realized capital gains and losses. We exploit plausibly exogenous sales due to mutual fund liquidations for identification. Specifically, we estimate the marginal propensity to reinvest out of one dollar received from a forced liquidation, when the investor either achieved a gain or a loss relative to his or her initial investment. Theoretically, if individuals held optimized portfolios, the marginal propensity to reinvest out of forced sales should be 100%. Individuals should just reinvest all of their liquidity immediately into a fund with similar characteristics. Empirically, individuals reinvest 83% on average if the forced sale resulted in a gain, but only 40% in the event of a loss. If individuals do not reinvest, they keep a share of their newly found liquidity in cash, save it, or consume it. Such differential treatment of gains and losses is inconsistent with active rebalancing or tax considerations, but consistent with mental accounting and the idea that individuals treat realized losses differently than paper losses. We thus provide evidence for realization utility and effects (Barberis and Xiong, 2012; Imas, 2016) and that individuals do not appear to learn rationally from experiences in the stock market (Malmendier and Nagel, 2011; Koudijs and Voth, 2016).
13.	The Consequences of Invention Secrecy: Evidence from the USPTO Patent Secrecy Program in World War II Daniel P. Gross #25545 Abstract: This paper studies the effects of the USPTO's patent secrecy program in World War II, under which approximately 11,200 U.S. patent applications were issued secrecy orders which halted examination and prohibited inventors from disclosing their inventions or filing in foreign countries. Secrecy orders were issued most heavily in areas important to the war effort — such as radar, electronics, and synthetic materials — and nearly all rescinded en masse at the end of the war. I find that compulsory invention secrecy was effective at keeping affected technology out of the public domain, but it appears to have reduced and delayed follow-on invention, reduced entry into patenting, and restricted commercialization. The results shed light on the consequences of invention secrecy, which is widely used by inventors to protect and appropriate the returns to innovation, and yield lessons for ongoing policy debates over potential measures to protect U.S. invention against the growing incidence of foreign IP theft today.
14.	Asset Prices and Corporate Responses to Bank of Japan ETF Purchases Ben Charoenwong, Randall Morck, and Yupana Wiwattanakantang #25525 Abstract: Since 2010, the Bank of Japan (BOJ) has purchased stocks to boost domestic firms’ valuations to increase GDP growth. The stock return elasticity with respect to BOJ purchases relative to the previous month’s market cap is around 2 and increases across longer horizons. Over one quarter, BOJ share purchases worth 1% of assets correspond to an increase of 1% in share valuation and a .27% increase in assets. Consistent with elevated valuations letting firms “cash out,” BOJ share purchases predict equity issuances and fewer stock buybacks. However, less than 9% of increased assets reflect net tangible capital investments, whereas cash and short-term investments account for over 50%. This unconventional monetary stimulus thus boosts share prices but is largely not transmitted into real investment growth.
15.	Discrimination In The Age Of Algorithms Jon Kleinberg, Jens Ludwig, Sendhil Mullainathan, and Cass R. Sunstein #25548 Abstract: The law forbids discrimination. But the ambiguity of human decision-making often makes it extraordinarily hard for the legal system to know whether anyone has actually discriminated. To understand how algorithms affect discrimination, we must therefore also understand how they affect the problem of detecting discrimination. By one measure, algorithms are fundamentally opaque, not just cognitively but even mathematically. Yet for the task of proving discrimination, processes involving algorithms can provide crucial forms of transparency that are otherwise unavailable. These benefits do not happen automatically. But with appropriate requirements in place, the use of algorithms will make it possible to more easily examine and interrogate the entire decision process, thereby making it far easier to know whether discrimination has occurred. By forcing a new level of specificity, the use of algorithms also highlights, and makes transparent, central tradeoffs among competing values. Algorithms are not only a threat to be regulated; with the right safeguards in place, they have the potential to be a positive force for equity.
16.	Effects of Maternal Work Incentives on Adolescent Social Behaviors Dhaval M. Dave, Hope Corman, Ariel Kalil, Ofira Schwartz-Soicher, and Nancy Reichman #25527 Abstract: This study exploits variations in the timing of welfare reform implementation in the U.S. in the 1990s to identify plausibly causal effects of welfare reform on a range of social behaviors of the next generation as they transition to adulthood. We focus on behaviors that are important for socioeconomic and health trajectories, estimate effects by gender, and explore potentially mediating factors. Welfare reform had no favorable effects on any of the youth behaviors examined and led to decreased volunteering among girls, increases in skipping school, damaging property, and fighting among boys, and increases in smoking and drug use among both boys and girls, with larger effects for boys (e.g., ~6% for boys compared to 4% for girls for any substance use). Maternal employment, supervision, and child’s employment explain little of the effects. Overall, the intergenerational effects of welfare reform on adolescent behaviors were unfavorable, particularly for boys, and do not support longstanding arguments that limiting cash assistance leads to responsible behavior in the next generation. As such, the favorable effects of welfare reform for women may have come at a cost to the next generation, particularly to boys who have been falling behind girls in high school completion for decades.
17.	Import Competition, Heterogeneous Preferences of Managers, and Productivity Cheng Chen and Claudia Steinwender #25539 Abstract: Empirical evidence on the relationship between import competition and firm productivity is mixed. We explore a new dimension of firm heterogeneity by focusing on different types of managers. Using Spanish firm-level data, we show that import competition leads to productivity increases for family-managed firms that are initially unproductive. Productivity changes are driven by family management as opposed to family ownership or non-managing family members. This evidence is consistent with a model in which family managers care more about the survival of their firm than professional managers, which triggers additional effort when the firm is faced with an increased bankruptcy risk. We show evidence consistent with this mechanism.

18.	Contract Enforcement and Productive Efficiency: Evidence from the Bidding and Renegotiation of Power Contracts in India Nicholas Ryan #25547 Abstract: Weak contract enforcement may reduce the efficiency of investment in developing countries. I study how contract enforcement affects efficiency in procurement auctions for the largest power projects in India. I gather data on bidding and ex post contract renegotiation and find that the renegotiation of contracts in response to cost shocks is widespread, despite that bidders are allowed to index their bids to future costs like the price of coal. Connected firms choose to index less of the value of their bids to coal prices and, through this strategy, expose themselves to cost shocks to induce renegotiation. I use a structural model of bidding in a scoring auction to characterize equilibrium bidding when bidders are heterogeneous both in cost and in the payments they expect after renegotiation. The model estimates show that bidders offer power below cost due to the expected value of later renegotiation. The model is used to simulate bidding and efficiency with strict contract enforcement. Contract enforcement is found to be pro-competitive. With no renegotiation, equilibrium bids would rise to cover cost, but markups relative to total contract value fall sharply. Production costs decline, due to projects being allocated to lower-cost bidders over those who expect larger payments in renegotiation.
19.	Technological Progress and Health Convergence: The Case of Penicillin in Post-War Italy Marcella Alsan, Vincenzo Atella, Jay Bhattacharya, Valentina Conti, Iván Mejía-Guevara, and Grant Miller #25541 Abstract: Throughout history, technological progress has transformed population health, but the distributional effects of these gains are unclear. New substitutes for older, more expensive health technologies can produce convergence in population health outcomes, but may also be prone to “elite capture” leading to divergence. This paper studies the case of penicillin using detailed mortality statistics and exploiting its sharply-timed introduction in Italy after World War II. We find penicillin reduced both the mean and standard deviation of infectious diseases mortality, leading to substantial convergence across disparate regions of Italy. Our results do not appear to be confounded by competing risks or mortality patterns associated with World War II.
20.	Spatial Linkages, Global Shocks, and Local Labor Markets: Theory and Evidence Rodrigo Adão, Costas Arkolakis, and Federico Esposito #25544 Abstract: Abstract How do shocks to economic fundamentals in the world economy affect local labor markets? In a framework with a flexible structure of spatial linkages, we characterize the model-consistent shock exposure of a local market as the exogenous shift in its production revenues and consumption costs. In general equilibrium, labor outcomes in any market respond directly to the market’s own shock exposure, and indirectly to other markets shocks exposures. We show how spatial linkages control the size and the heterogeneity of these indirect effects. We then develop a new estimation methodology – the Model-implied Optimal IV (MOIV) – that exploits quasi-experimental variation in economic shocks to estimate spatial linkages and evaluate their counterfactual implications. Applying our methodology to US Commuting Zones, we find that difference-in-difference designs based on model-consistent measures of local shock exposure approximate well the differential effect of international trade shocks across CZs, but miss around half of the aggregate effect, partly due to the offsetting action of indirect effects.
21.	Fading Stars Germán Gutiérrez and Thomas Philippon #25529 Abstract: We study the evolution of super star firms in the U.S. economy over the past 60 years. Contrary to common wisdom, super stars firms have not become larger, have not become more productive, and the contribution of star firms to aggregate U.S. productivity growth has fallen by more than one third since 2000.
22.	Sovereign Bonds since Waterloo Josefin Meyer, Carmen M. Reinhart, and Christoph Trebesch #25543 Abstract: This paper studies external sovereign bonds as an asset class. We compile a new database of 220,000 monthly prices of foreign-currency government bonds traded in London and New York between 1815 (the Battle of Waterloo) and 2016, covering 91 countries. Our main insight is that, as in equity markets, the returns on external sovereign bonds have been sufficiently high to compensate for risk. Real ex-post returns averaged 7% annually across two centuries, including default episodes, major wars, and global crises. This represents an excess return of around 4% above US or UK government bonds, which is comparable to stocks and outperforms corporate bonds. The observed returns are hard to reconcile with canonical theoretical models and with the degree of credit risk in this market, as measured by historical default and recovery rates. Based on our archive of more than 300 sovereign debt restructurings since 1815, we show that full repudiation is rare; the median haircut is below 50%.
23.	Understanding the Correlation between Alzheimer’s Disease Polygenic Risk, Wealth, and the Composition of Wealth Holdings Su H. Shin, Dean R. Lillard, and Jay Bhattacharya #25526 Abstract: We investigate how the genetic risk of developing Alzheimer's Disease (AD) relates to saving behavior. Using nationally representative data from the 1992-2014 Health and Retirement Study (HRS), we find that genetic predisposition for AD correlates with, but is not causally related to older individuals’ wealth holdings. People with higher Alzheimer’s Disease polygenic risk score (PGS) hold roughly 9 percent more wealth in CDs (hands-off assets) and around 11 percent, 15 percent, and 7 percent less wealth in stocks, IRAs, and other financial assets (hands-on assets) respectively. We explore three hypotheses that could explain these correlations. We hypothesize that people with high risk of AD choose different portfolios because: (i) they know their polygenic risk of developing Alzheimer’s Disease and related dementia, (ii) they have lower cognitive capacity, and (iii) the genome-wide association studies (GWAS) process that generated the Alzheimer’s Disease PGS failed to fully account for the aging process. Our extended model results do not support the first two hypotheses. Consistent with the third hypothesis, the interaction between age and the Alzheimer’s Disease PGS explains the correlation between genetic traits and asset holdings.
24.	Intergenerational Mobility in Africa Alberto Alesina, Sebastian Hohmann, Stelios Michalopoulos, and Elias Papaioannou #25534 Abstract: We examine intergenerational mobility (IM) in educational attainment in Africa since independence, using census data from 26 countries. First, we map and characterize the geography of IM. There is substantial variation both across and within countries with differences in literacy of the old generation being the strongest correlate of IM. Inertia is stronger for rural, as compared to urban, households and present for both boys and girls. Second, we explore the correlates of mobility across more than 2,800 regions. Colonial investments in the transportation network and missionary activity are associated with upward mobility. IM is also higher in regions close to the coast and national capitals as well as in rugged areas without malaria. Upward mobility is higher and downward mobility is lower in regions that were more developed at independence, with higher urbanization and employment in services and manufacturing. Third, we identify the effects of regions on educational mobility by exploiting within-family variation from children whose families moved during primary school age. While sorting is sizable, there are considerable regional exposure effects.
25.	The Economics of Parenting Matthias Doepke, Giuseppe Sorrenti, and Fabrizio Zilibotti #25533 Abstract: Parenting decisions are among the most consequential choices people make throughout their lives. Starting with the work of pioneers such as Gary Becker, economists have used the toolset of their discipline to understand what parents do and how parents' actions affect their children. In recent years, the literature on parenting within economics has increasingly leveraged findings and concepts from related disciplines that also deal with parent-child interactions. For example, economists have developed models to understand the choice between various parenting styles that were first explored in the developmental psychology literature, and have estimated detailed empirical models of children's accumulation of cognitive and noncognitive skills in response to parental and other inputs. In this paper, we survey the economic literature on parenting and point out promising directions for future research.
26.	Child Penalties Across Countries: Evidence and Explanations Henrik Kleven, Camille Landais, Johanna Posch, Andreas Steinhauer, and Josef Zweimüller #25524 Abstract: This paper provides evidence on child penalties in female and male earnings in different countries. The estimates are based on event studies around the birth of the first child, using the specification proposed by Kleven et al. (2018). The analysis reveals some striking similarities in the qualitative effects of children across countries, but also sharp differences in the magnitude of the effects. We discuss the potential role of family policies (parental leave and child care provision) and gender norms in explaining the observed differences.