Hoa Vu

Postdoctoral Research Associate
University of Wisconsin-Madison

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hoa.vu@wisc.edu
+1 (623) 202 2326

Department of Population Health Sciences
University of Wisconsin-Madison
Warf Office Bldg, 610 Walnut St #707
Madison, WI 53726

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Working Papers

I Wish I Were Born in Another Time: Unintended Consequences of Immigration Enforcement on Birth Outcomes (Job Market Paper)

This paper studies the effects of Secure Communities (SC), a wide-ranging immigration enforcement program, on infant health outcomes in the United States. Using administrative birth certificate data together with event study and triple-difference designs, I find that SC increases the incidence of very low birth weight by 20% for infants of foreign-born Hispanic mothers, who were most likely to be affected by immigration enforcement. There is suggestive evidence that the results are consistent with (i) changes in maternal stress induced by deportation fear and (ii) inadequate prenatal nutrition. A back-of-the-envelope calculation suggests that the unintended social cost of immigration enforcement approaches $2 billion annually.

The Spillover Effects of E-Verify on High-Skilled Citizen Women

Verify Employment Eligibility (E-Verify) is designed to curb the hiring of unauthorized immigrants. This paper examines the spillover impact of E-Verify on highly-educated citizen women's labor supply (particularly those with young children). Using variation in the implementation of E-Verify across states, I find that E-Verify reduces the labor supply of high-skilled citizen women by 0.3 to 1 percentage point. These estimates are larger for women with children. Supplemental analyses suggest that lower inflows of undocumented migrants is an important channel. A back-of-the-envelope calculation suggests that E-Verify generated $6.1 billion in annual social costs of lower labor supply of high-skilled citizen women.

The Healthy Undocumented Immigrant Effect: Evidence from the US

This paper uses the residual approach to identify undocumented populations hidden in micro survey data. I then document what I term the "Healthy Undocumented Immigrant Effect": undocumented immigrants are healthier than legal immigrants. I show evidence that the paradox of the undocumented immigrants’ health advantage can be attributed to the return-migrant effect.

Two Stage 2 × 2 Games With Strategic Substitutes and Strategic Heterogeneity
with Tarun Sabarwal.

We extend Feng and Sabarwal (2018)’s results on two stage 2×2 games with strategic complements to games with strategic substitutes and games with strategic heterogeneity. We characterize strategic substitutes and strategic heterogeneity in such games, and show that the set of such games has infinite measure. Our conditions are easy to apply and yield uncountably many examples of such games. Moreover, in contrast to the case for strategic complements, we show that generically, the set of SPNE in these games is totally unordered (no two equilibria are comparable).