Zheng, Xiaoyong

By: Kim, Jong-Jin; Zheng, Xiaoyong
We propose a model that elucidates the two channels through which alternative marketing arrangements affect spot price in livestock markets. The direct effect works through their effect on demand and supply. The indirect effect works through spot price volatility, which has been ignored in the literature. We then estimate a dynamic model with data from the U.S. hog market to test our model implications and quantify the two effects. We find increases in the use of AMAs increase spot price volatility and decrease spot price level. The short-run effects are small but the long-run effects are nontrivial.
By: Robinson, Christina A.; Zheng, Xiaoyong
This study examines the dynamic relationship between a household’s Food Stamp Program (FSP) participation and the extent to which children in the household are overweight or obese. In contrast to previous studies employing static models, our results suggest that FSP participation significantly affects the deviation of current body mass index (BMI) from the ideal level in older male children who are currently underweight and for older female children who are already overweight. For older male children, the effect is desirable; for older females, however, our findings indicate that FSP participation has an adverse effect on their health and may contribute to being overweight or obese.