Working Paper
Duflo E, Banerjee A, Finkelstein A, Katz LF, Olken BA, Sautmann A. In Praise of Moderation: Suggestions for the Scope and Use of Pre-Analysis Plans for RCTs in Economics. Working Paper. Publisher's VersionAbstract

Pre-Analysis Plans (PAPs) for randomized evaluations are becoming increasingly common in Economics, but their definition remains unclear and their practical applications therefore vary widely. Based on our collective experiences as researchers and editors, we articulate a set of principles for the ex-ante scope and ex-post use of PAPs. We argue that the key benefits of a PAP can usually be realized by completing the registration fields in the AEA RCT Registry. Specific cases where more detail may be warranted include when subgroup analysis is expected to be particularly important, or a party to the study has a vested interest. However, a strong norm for more detailed pre-specification can be detrimental to knowledge creation when implementing

field experiments in the real world. An ex-post requirement of strict adherence to pre-specified plans, or the discounting of non-pre-specified work, may mean that some experiments do not take place, or that interesting observations and new theories are not explored and reported. Rather, we recommend that the final research paper be written and judged as a distinct object from the “results of the PAP”; to emphasize this distinction, researchers could consider producing a short, publicly available report (the “populated PAP”) that populates the PAP to the extent possible and briefly discusses any barriers to doing so.

Goldin C, Katz LF. The Incubator of Human Capital: The NBER and the Rise of the Human Capital Paradigm. Working Paper. Publisher's VersionAbstract
The human capital construct is deep in the bones of economics and finds reference by many classical economists, even if they did not use the phrase. The term “human capital,” seldom mentioned in economics before the 1950s, increased starting in the 1960s and blossomed in the 1990s. The upsurge in NBER publications was even greater. Using EconLit codes from 1990 to 2019, the use of human capital among NBER books increased from 5% to 25%, whereas all economics books changed from 3% to 6%. For NBER working papers, 3% referenced human capital around 1990, but 10% have more recently. The figures for all economics articles are 4% and 6%. The NBER played an outsized role in the rise of the concept of human capital mainly because of the emphasis on empiricism at the NBER. We explore how the NBER was an incubator of human capital research and the ways human capital theory brought the NBER into the modern era of economics.
Bergman P, Chetty R, DeLuca S, Hendren N, Katz LF, Palmer C. Creating Moves to Opportunity: Experimental Evidence on Barriers to Neighborhood Choice. Working Paper. Publisher's VersionAbstract

Low-income families in the United States tend to live in neighborhoods that offer limited opportunities for upward income mobility. One potential explanation for this pattern is that families prefer such neighborhoods for other reasons, such as affordability or proximity to family and jobs. An alternative explanation is that they do not move to high-opportunity areas because of a lack of information or barriers that prevent them from making such moves. We test between these explanations using a two-phase randomized controlled trial with housing voucher recipients in Seattle and King County. We first provided a bundle of resources to facilitate moves to high-upward-mobility neighborhoods: information about high-opportunity areas, short-term financial assistance, customized assistance during the housing search process, and connections to landlords. This bundled intervention increased the fraction of families who moved to high-upward-mobility areas from 15% in the control group to 53% in the treatment group. To understand the mechanisms underlying this effect, we ran a second phase with three arms: (1) information about high-opportunity areas and financial assistance only; (2) reduced support services in addition to information and financial assistance; and (3) full support services, as in the original bundled intervention. The full services had five times as large a treatment effect as the information and financial incentives treatment and three times as large an effect as the reduced support intervention, showing that high-intensity, customized support enables moves to opportunity. Interviews with randomly selected families reveal that the program succeeded by relaxing families' bandwidth constraints and addressing their specific needs, from identifying suitable units to providing emotional support to brokering with landlords. Families induced to move to higher opportunity areas tend to stay in their new neighborhoods in subsequent years and report higher levels of neighborhood satisfaction after moving. Our findings imply that many low-income families do not have a strong preference to stay in low-opportunity areas and that barriers in the housing search process are a central driver of residential segregation by income.

Yang E, Bernardi A, Metz R, Miller C, Katz LF, Isen A. An Earned Income Tax Credit That Works for Singles: Final Impact Findings from the Paycheck Plus Demonstration in Atlanta. New York City: MDRC; 2022. Publisher's Version paycheck_plus_atlanta_final_3.1_all_508.pdf
Miller C, Katz LF, Isen A. Increasing the Earned Income tax Credit for Childless Workers: A Synthesis of Findings from the Paycheck Plus Demonstration. New York City: MDRC; 2022. Publisher's Version pp_synthesis_brief_final.pdf
Courtin E, Allen HL, Katz LF, Miller C, Aloisi K, Muennig PA. Effect of Expanding the Earned Income Tax Credit to Americans without Dependent Children on Psychological Distress: The Paycheck Plus Health Study Randomized Controlled Trial. American Journal of Epidemiology. 2022;191 (8) :1444-52. Publisher's VersionAbstract
Anti-poverty policies have the potential to improve mental health. We conducted a randomized trial to investigate whether a fourfold increase in the Earned Income Tax Credit for low-income Americans without dependent children would reduce psychological distress relative to the current federal credit (Paycheck Plus, New York City site). Between 2013 and 2014, 5,968 participants were recruited; 2,997 were randomly assigned to the treatment group and 2,971 were assigned to the control group. Survey data were collected 32 months post-randomization (N=4,749). Eligibility for the program increased employment by 1.9 percentage points and after-bonus earnings by 6% ($635 per year) on average over the three years. Treatment was associated with a marginally statistically-significant decline in psychological distress relative to the control group (-0.30 points; 95% CI, -0.63 to 0.03; p=0.076). Women in the treated group experienced a half-a-point reduction in psychological distress (-0.55; 95% CI, -0.97 to -0.13; p=0.032) and noncustodial parents reported a 1.36 point reduction (95% CI, -2.24 to -0.49; p = 0.011) in psychological distress. An expansion of a large anti-poverty program to individuals without dependent children reduced psychological distress for women and noncustodial parents – the groups who benefitted the most in terms of increased after-bonus earnings.
Katz LF, Roth J, Hendra R, Schaberg K. Why Do Sectoral Employment Programs Work? Lessons from WorkAdvance. Journal of Labor Economics. 2022;40 (S1) :S249-S291. Publisher's VersionAbstract

This paper examines the evidence from randomized evaluations of sector-focused training programs that target low-wage workers and combine upfront screening, occupational and soft skills training, and wraparound services. The programs generate substantial and persistent earnings gains (12 to 34 percent) following training. Theoretical mechanisms for program impacts are explored for the WorkAdvance demonstration. Earnings gains are generated by getting participants into higher-wage jobs in higher-earning industries and occupations not just by raising employment. Training in transferable and certifiable skills (likely under-provided from poaching concerns) and reductions of employment barriers to high-wage sectors for non-traditional workers appear to play key roles.

Chyn E, Katz LF. Neighborhoods Matter: Assessing the Evidence for Place Effects. Journal of Economic Perspectives. 2021;35 (4) :197-222. Publisher's VersionAbstract

How does one’s place of residence affect individual behavior and long-run outcomes? Understanding neighborhood and place effects has been a leading question for social scientists during the past half-century. Recent empirical studies using experimental and quasi-experimental research designs have generated new insights on the importance of residential neighborhoods in childhood and adulthood. This paper summarizes the recent neighborhood effects literature and interprets the findings. Childhood neighborhoods affect long-run economic and educational outcomes in a manner consistent with exposure models of neighborhood effects. For adults, neighborhood environments matter for their health and well-being but have more ambiguous impacts on labor market outcomes. We discuss the evidence on the mechanisms behind the observed patterns and conclude by highlighting directions for future research.

Harding DJ, Sanbonmatsu L, Duncan GJ, Gennetian LA, Katz LF, Kessler RC, Kling JR, Sciandra M, Ludwig J. Evaluating Contradictory Experimental and Non-Experimental Estimates of Neighborhood Effects on Economic Outcomes for Adults. Housing Policy Debate. 2021. Publisher's VersionAbstract


Although non-experimental studies find robust neighborhood effects on adults, such findings have been challenged by results from the Moving to Opportunity (MTO) residential mobility experiment. Using a within-study comparison design, this paper compares experimental and nonexperimental estimates from MTO and a parallel analysis of the Panel Study of Income Dynamics (PSID). Striking similarities were found between non-experimental estimates based on MTO and PSID. No clear evidence was found that different estimates are related to duration of adult exposure to disadvantaged neighborhoods, non-linear effects of neighborhood conditions, magnitude of the change in neighborhood context, frequency of moves, treatment effect heterogeneity, or measurement, although uncertainty bands around our estimates were sometimes large. One other possibility is that MTO-induced moves might have been unusually disruptive, but results are inconsistent for that hypothesis. Taken together, the findings suggest that selection bias might account for evidence of neighborhood effects on adult economic outcomes in nonexperimental studies.


Courtin E, Aloisi K, Miller C, Allen HL, Katz LF, Muennig P. The Health Effects of Expanding the Earned Income Tax Credit: Results from New York City. Health Affairs. 2020;39 (7) :1149-56. Publisher's VersionAbstract
Antipoverty policies may hold promise as tools to improve health and reduce mortality rates among low-income Americans. We examined the health effects of the New York City Paycheck Plus randomized controlled trial. Paycheck Plus tests the impact of a potential fourfold increase in the Earned Income Tax Credit for low-income Americans without dependent children. Starting in 2015, Paycheck Plus offered 5,968 study participants a credit of up to $2,000 at tax time (treatment) or the standard credit of about $500 (control). Health-related quality of life and other outcomes for a representative subset of these participants (n = 3,289) were compared to those of a control group thirty-two months after randomization. The intervention had a modest positive effect on employment and earnings, particularly among women. It had no effect on health-related quality of life for the overall sample, but women realized significant improvements.
Miller C, Katz LF, Yang E, Bernardi A, Isen A, Aloisi K. A More Generous Earned Income Tax Credit for Singles: Interim Findings from the Paycheck Plus Demonstration in Atlanta.; 2020. Publisher's Version paycheck_plus_atlanta_interim_508_final.pdf
Autor D, Goldin C, Katz LF. Extending the Race between Education and Technology. AEA Papers and Proceedings. 2020;110 :347-51. Publisher's VersionAbstract

The race between education and technology provides a canonical framework that does an excellent job of explaining US wage structure changes across the twentieth century. The framework involves secular increases in the demand for more-educated workers from skill-biased technological change, combined with variations in the supply of skills from changes in educational access. We expand the analysis backwards and forwards. The framework helps explain rising skill differentials in the nineteenth and twenty-first centuries, but needs to be augmented to illuminate the recent convexification of education returns and implied slowdown in the growth of the relative demand for college workers. Increased educational wage differentials explain 75 percent of the rise of U.S. wage inequality from 1980 to 2000 as compared to 38 percent for 2000 to 2017.

Autor D, Dorn D, Katz LF, Patterson C, Reenen JV. The Fall of the Labor Share and the Rise of Superstar Firms. Quarterly Journal of Economics. 2020;135 (2) :645-709. Publisher's VersionAbstract

The fall of labor's share of GDP in the United States and many other countries in recent decades is well documented but its causes remain uncertain. Existing empirical assessments typically rely on industry or macro data, obscuring heterogeneity among firms. In this paper, we analyze micro panel data from the U.S. Economic Census since 1982 and document empirical patterns to assess a new interpretation of the fall in the labor share based on the rise of “superstar firms." If globalization or technological changes push sales towards the most productive firms in each industry, product market concentration will rise as industries become increasingly dominated by superstar firms. Since these firms have high markups and a low labor share of value-added and sales, a reallocation of output toward superstar firms depresses the aggregate labor share. We empirically assess seven predictions of this hypothesis: (i) industry sales will increasingly concentrate in a small number of firms; (ii) industries where concentration rises most will have the largest declines in the labor share; (iii) the fall in the labor share will be driven largely by reallocation rather than a fall in the unweighted mean labor share across all firms; (iv) the between firm reallocation component of the fall in the labor share will be greatest in the sectors with the largest increases in market concentration; (v) the industries that are becoming more concentrated will exhibit faster growth of productivity; (vi) the aggregate markup will rise more than the typical firm's markup; and (vii) these patterns should be observed not only in U.S. firms, but also internationally. We find support for all of these predictions.

Katz LF, Krueger AB. Understanding Trends in Alternative Work Arrangements in the United States. RSF: Russell Sage Journal of the Social Sciences. 2019;5 (5) :132-146. Publisher's VersionAbstract
This paper describes and tries to reconcile trends in alternative work arrangements in the United States using data from the Contingent Worker Survey supplements to the Current Population Survey (CPS) for 1995 to 2017, the 2015 RAND-Princeton Contingent Work Survey (CWS), and administrative tax data from the Internal Revenue Service for 2000 to 2016. We conclude that there likely has been a modest upward trend in the share of the U.S. workforce in alternative work arrangements during the 2000s based on the cyclically-adjusted comparisons of the CPS CWS’s, measures using self-respondents in the CPS CWS, and measures of self-employment and 1099 workers from administrative tax data. We also present evidence from Amazon Mechanical Turk that suggests that the basic monthly CPS question on multiple job holding misses many instances of multiple job holding.
Katz LF, Krueger AB. The Rise and Nature of Alternative Work Arrangements in the United States, 1995-2015. ILR Review. 2019;72 (2) :382-416. Publisher's VersionAbstract


To monitor trends in alternative work arrangements, we conducted a version of the Contingent Worker Survey as part of the RAND American Life Panel in late 2015. The findings point to a rise in the incidence of alternative work arrangements in the U.S. economy from 1995 to 2015. The percentage of workers engaged in alternative work arrangements – defined as temporary help agency workers, on-call workers, contract workers, and independent contractors or freelancers – rose from 10.7 percent in February 2005 to possibly as high as 15.8 percent in late 2015. Workers who provide services through online intermediaries, such as Uber or Task Rabbit, accounted for 0.5 percent of all workers in 2015. About twice as many workers selling goods or services directly to customers reported finding customers through offline intermediaries than through online intermediaries.


Miller C, Katz LF, Azurdia G, Isen A, Schultz C, Aloisi K. Boosting the Earned Income Tax Credit for Singles: Final Impact Findings from the Paycheck Plus Demonstration in New York City.; 2018. Publisher's Version paycheckplus_finalreport.pdf
Women Working Longer: Increased Employment at Older Ages
Goldin C, Katz LF. Women Working Longer: Increased Employment at Older Ages. Chicago: University of Chicago Press and NBER; 2018 pp. 304. Publisher's Version
Katz LF, Poo A-jen, Waxman E. Imagining a Future of Work That Fosters Mobility for All. Washington, DC: US Partnership on Mobility from Poverty; 2018. Publisher's Version future_of_work_paper.pdf
Goldin C, Katz LF. Women Working Longer: Facts and Some Explanations. In: Women Working Longer: Increased Employment at Older Ages. Chicago: University of Chicago Press and NBER ; 2018. pp. 11-53. Publisher's VersionAbstract

American women are working more, through their sixties and even into their seventies. Their increased participation at older ages started in the late 1980s before the turnaround in older men’s labor force participation and the economic downturns of the 2000s. The higher labor force participation of older women consists disproportionately of those working at full-time jobs. Increased labor force participation of women in their older ages is part of the general increase in cohort labor force participation. Cohort effects, in turn, are mainly a function of educational advances and greater prior work experience. But labor force participation rates of the most recent cohorts in their forties are less than those for previous cohorts. It would appear that employment at older ages could stagnate or even decrease. But several other factors will be operating in an opposing direction leading us to conclude that women are likely to continue to work even longer.

Clement D, Katz L. Interview with Lawrence Katz. The Region. 2017. Publisher's Version