英文文献："A Definition at Last, but What Does It All Mean?"—Newspaper Coverage of the USDA Organic Seal and its Effects on Food Purchases--“终于有了定义，但这一切意味着什么呢?”美国农业部有机食品封印的报纸报道及其对食品购买的影响
英文文献作者：Kiesel, Kristin
英文文献摘要：
This paper estimates the effects of media coverage in organic food production and the National Organic Program (NOP) on food purchases. Information from several independent data sources is complied into a unique data set that directly links national and local newspaper coverage to fluid milk consumption. An analysis of weekly store-level scanner data in a difference-in-differences approach suggests average increases in organic milk sales relative to conventional milk sales of 5 percent during weeks for which relevant news coverage is observed. Increases in intensity of news coverage, measured by the number of articles in a given week, are further found to increase the relative difference in sales but at a decreasing rate. However, these effects are found to dissipate quickly in the weeks following news coverage. Differentiating by context of observed articles suggests that product category specific coverage doubles observed increases in sales when compared to general coverage, while critical national and local coverage does not result in significant changes in organic milk sales. Furthermore, local news coverage seems to have a relatively higher impact than national news coverage, with increases in circulation of one local newspaper resulting in increased organic milk sales as well. Our results provide valuable insights for the evaluation of existing labeling regulations and future regulations on specialty foods in this context.

本文估计了有机食品生产中的媒体报道和国家有机计划(NOP)对食品购买的影响。来自几个独立数据源的信息被汇编成一个独特的数据集，直接将国家和地方报纸的报道与液态奶的消费联系起来。对商店级别扫描仪的每周数据进行的差异分析表明，在观察到相关新闻报道的几周内，有机牛奶的销量相对于传统牛奶的销量平均增长5%。我们进一步发现，以一周内文章数量衡量的新闻报道强度的增加，会增加销售的相对差异，但速度呈递减趋势。然而，人们发现，这些影响在新闻报道后的几周内迅速消散。根据所观察到的文章的背景进行区分表明，与一般报道相比，特定产品类别的报道增加了两倍的销售额，而关键的国家和地方报道并不会导致有机牛奶销售的显著变化。此外，地方新闻报道似乎比全国新闻报道具有相对更高的影响力，一份地方报纸发行量的增加也增加了有机牛奶的销售。在此背景下，我们的研究结果为评估现有的标签法规和未来的特殊食品法规提供了有价值的见解。