This study examined the effects of meteorological and farm input cost factors on the onion yields in Korea by employing a panel regression analysis. Also, it investigated the variables' interdependencies and their relations to the onion yields by using a Bayesian network model. We collected the panel data from 1991 to 2019 for our analysis. More specifically, we used the panel data of the regional meteorological factors by month (cumulative precipitation, cumulative sunshine duration, average relative humidity, average temperature), farm input cost factors of the onion (the cost of fertilizer and the cost of agricultural medicines), and the onion yield of three regions in Korea. We used STATA 14.0 and Hugin Expert for descriptive analysis, panel regression analysis, and the Bayesian network model. Our analysis can be summarized in two significant ways. First, we chose the fixed-effect model based on the Hausman test. The results based on the fixed-effect model confirmed that the average relative humidity (October, -), the cumulative precipitation (January, -; March, +; May, +), the cumulative sunshine duration (April, +), the average temperature (June, -), the cost of fertilizer(+) and the cost of agricultural medicines(+) were the significant variables of the model. Second, we analyzed the relationship between meteorological factors and farm input cost factors on the onion yields through the Bayesian network model and showed that the Bayesian network model is a promising analysis method that is useful in the agricultural sector to predict the yield. We also discussed the implications and limitations of this study and future research directions at the end of the paper.

This study analyzes the effects of international grain price variations on the domestic consumer price index using a nonlinear ARDL model, which significantly reduces specification errors. The key results show that only when international grain prices increase, the domestic consumer price index goes together with them but not vice versa. More specifically, when international grain price increased by 10%, the domestic total consumer price index went up by 0.39%. These results have significance as we obtained very similar results from our analysis of the effects of using individual products. Also, this study is distinguishable from others because we considered the possibility of omitted variable biases from exchange rates and imported prices of other goods closely correlated with imported grain prices.

This study analyzes social welfare changes as a result of improving the GAP certification standards by taking into consideration both the consumer and producer sides of agricultural products. In the analysis, we set hypotheses for improving the GAP certification standards in three directions, including promoting consumption, pursuing internationalization, and accelerating popularization. Also, we calculated social welfare changes following each scenario of the improvement of GAP certification standards. Our analysis shows that social welfare associated with all agricultural products is likely to increase along with enhanced GAP certification standards.

This study examined the effect of consumer anxiety on food hazards and food consumer information literacy for dietary life satisfaction with domestic and imported foods. Our analysis resulted in three significant findings. First, the information utilization, synthesis, and evaluation factor, the information search and access factor, goal setting for information search factor among food consumer information literacy, consumer anxiety on food hazards, and dietary life satisfaction showed significant correlations. Second, due to our analysis of the effect of consumer anxiety of food hazards and food consumer information literacy on dietary life satisfaction, consumer anxiety on food hazards and the consumer's gender affect dietary life satisfaction with domestic and imported foods. Third, goal setting for information search had a full mediating effect on dietary life satisfaction with domestic foods. Information utilization, synthesis, and evaluation showed a full mediating effect on dietary life satisfaction with imported foods. On the other hand, goal setting for information search had a partial mediating effect. Consequently, food consumer information literacy has direct or indirect impacts on dietary life satisfaction with domestic and imported foods.