NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH
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Xilin Zhou

Department of Economics
Andrew Young School of Policy Studies
P.O. Box 3992
Atlanta, GA 30302-3992
Georgia

E-Mail: EmailAddress: hidden: you can email any NBER-related person as first underscore last at nber dot org
Institutional Affiliation: Georgia State University

NBER Working Papers and Publications

June 2018Do Walmart Supercenters Improve Food Security?
with Charles J. Courtemanche, Art Carden, Murugi Ndirangu: w24750
This paper examines the effect of Walmart Supercenters, which lower food prices and expand food availability, on household and child food insecurity. Our food insecurity-related outcomes come from the 2001-2012 waves of the December Current Population Study Food Security Supplement. Using narrow geographic identifiers available in the restricted version of these data, we compute the distance between each household’s census tract of residence and the nearest Walmart Supercenter. We estimate instrumental variables models that leverage the predictable geographic expansion patterns of Walmart Supercenters outward from Walmart’s corporate headquarters. Results suggest that closer proximity to a Walmart Supercenter improves the food security of households and children, as measured by number of a...

Published: Charles Courtemanche & Art Carden & Xilin Zhou & Murugi Ndirangu & Craig Gundersen, 2019. "Do Walmart Supercenters Improve Food Security?," Applied Economic Perspectives and Policy, vol 41(2), pages 177-198.

May 2017Parental Work Hours and Childhood Obesity: Evidence using Instrumental Variables Related to Sibling School Eligibility
with Charles Courtemanche, Rusty Tchernis: w23376
This study exploits plausibly exogenous variation from the youngest sibling’s school eligibility to estimate the effects of parental work on the weight outcomes of older children in the household. Data come from the 1979 cohort of the National Longitudinal Survey of Youth linked to the Child and Young Adult Supplement. We first show that mothers’ work hours increase gradually as the age of the youngest child rises, whereas mothers’ spouses’ work hours exhibit a discontinuous jump at kindergarten eligibility. Leveraging these insights, we develop an instrumental variables model that shows that parents’ work hours lead to larger increases in children’s BMI z-scores and probabilities of being overweight and obese than those identified in previous studies. We find no evidence that the impacts ...
 
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