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안병일,Rodolfo M. Nayga, Jr. 연세대학교 동서문제연구원 2016 Global economic review Vol.45 No.2
Domestic, US and Australian beef, which are differentiated by country of origin, are sold in Korea. In this differentiated product market, tariff reductions through Free Trade Agreements (FTAs) are expected to strengthen the competitiveness of imported beef and, therefore, to mitigate the effects arising from the market power of domestic marketers. The present study develops a simulation model that evaluates this mitigating effect by explicitly reflecting the market structure that domestic beef marketers constitute. The simulation results indicate that the farm-retail marketing margin would decrease by 10.59% or 6.79% due to the Korea–US and Korea–Australia FTAs, respectively, if domestic beef marketers formed a cartel or an oligopoly market (i.e. the degree of market power is 0.5), while the marketing margin under a competitive market scenario is simulated to have no change. The value of beef production would decrease by 1009 million dollars if the marketers form a cartel and hence exercise monopoly power. The FTAs are simulated to reduce the value of beef production by 564 million dollars under the competitive market scenario.
The Effect of the Fresh Fruit and Vegetable Program on Childhood Obesity
Qian, Yiwei,Nayga Jr., Rodolfo M.,Thomsen, Michael R.,Rouse, Heather L. Oxford University Press 2016 Applied economic perspectives and policy Vol.38 No.2
<P>This paper investigates how the Fresh Fruit and Vegetable Program (FFVP), a nutrition assistance program that provides funding for the distribution of free fresh fruits and vegetables to students in participating schools, affects childhood obesity using a panel data set of Arkansas public schoolchildren with two different approaches. First, we combine matching methodology and difference-in-differences (DID) analysis. Second, we use the synthetic control method to compare each FFVP participating school to a similar, albeit synthetic, control school. Both analyses show that FFVP program causes an economically meaningful reduction in the obesity outcome of participating children.</P>
Does Healthy Food Access Matter in a French Urban Setting?
Caillavet, France,Kyureghian, Gayaneh,Nayga Jr., Rodolfo M.,Ferrant, Coline,Chauvin, Pierre Oxford University Press 2015 AMERICAN JOURNAL OF AGRICULTURAL ECONOMICS - Vol.97 No.5
<P>Limited access to healthy food is commonly regarded as a contributing factor to poor dietary choices. The objective of this article is to test this hypothesis in a French context given France's increasing obesity rates and incidence of poor dietary habits. We use data on fruit and vegetable consumption frequency and different food retail availability measures, for example the number of food stores, food surface area, and a dispersion measure based on store numbers, store types, and food area surface, from several data sources in France. We also employ different types of geographic units when measuring the food retail environment and instrumental variable model specifications to test the robustness of our results, which indicate that fewer but larger retail outlets increase the odds of consuming the recommended level of fruit and vegetables. We also find that an increase in food supply dispersion will improve fruit and vegetable consumption in Paris, but not in its suburbs.</P>
Hypothetical Bias and Substitutes in Stated Preference Survey: The Case of Irradiated Meat
이지용,John A. Fox,Rodolfo M. Nayga, Jr.,한두봉 한국농업경제학회 2018 農業經濟硏究 Vol.59 No.3
We examine whether allowing field substitutes to be simultaneously valued with a good of interest in a hypothetical valuation survey moderates behavioral bias between hypothetical statements and actual behaviors. We use a within-sample experiment and compare values in a hypothetical survey with values in a non-hypothetical experimental auction. Especially, we test whether a common calibration function exists for the good of interest with and without the presence of substitutes. We then estimate each calibration function and compare calibration factors. We find that hypothetical bias differs with and without the presence of substitutes and allowing the field substitutes to be simultaneously valued with the product of interest in a hypothetical valuation survey reduces hypothetical bias. Our results suggest that considering substitutes in the application of stated preference survey can help identify the true underlying demand conditions.
Hypothetical Bias and Substitutes in Stated Preference Survey: The Case of Irradiated Meat
( Ji Yong Lee ),( John A. Fox ),( Rodolfo M. Nayga Jr ),( Doo Bong Han ) 한국농업경제학회 2018 KOREAN JOURNAL OF AGRICULTURAL ECONOMICS(KJAT) Vol.59 No.3
We examine whether allowing field substitutes to be simultaneously valued with a good of interest in a hypothetical valuation survey moderates behavioral bias between hypothetical statements and actual behaviors. We use a within-sample experiment and compare values in a hypothetical survey with values in a non-hypothetical experimental auction. Especially, we test whether a common calibration function exists for the good of interest with and without the presence of substitutes. We then estimate each calibration function and compare calibration factors. We find that hypothetical bias differs with and without the presence of substitutes and allowing the field substitutes to be simultaneously valued with the product of interest in a hypothetical valuation survey reduces hypothetical bias. Our results suggest that considering substitutes in the application of stated preference survey can help identify the true underlying demand conditions.