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Product churn, tastes, and price indices 产品变动，口味和价格指数
IF 4.9 2区 经济学
American Journal of Agricultural Economics Pub Date : 2026-09-09 Epub Date: 2025-11-27 DOI: 10.1111/ajae.70031
Hao Lan, Tim Lloyd, Steve McCorriston, Cesar Revoredo-Giha
{"title":"Product churn, tastes, and price indices","authors":"Hao Lan,&nbsp;Tim Lloyd,&nbsp;Steve McCorriston,&nbsp;Cesar Revoredo-Giha","doi":"10.1111/ajae.70031","DOIUrl":"https://doi.org/10.1111/ajae.70031","url":null,"abstract":"<p>Price indices commonly used to measure inflation do not account for the entry and exit of products nor for systemic changes in consumer preferences over time. Recent developments in the theory of price indices show that these issues have significant impacts on the growth of prices that consumers experience. However, executing these developments requires access to household-level data. Analyzing the ready meal purchases of 30,000 UK households during 2013–2022, we evaluate the extent of the bias between standard price indices and those that accommodate product churn as well as changes in consumer tastes. Household data also permit the effects to be calculated across income groups. Our results show that price indices commonly used to measure inflation significantly overstate the extent of price increases due to: (i) “representative” prices used to measure the Consumer Prices Index do not adequately capture the prices of goods in household baskets, and (ii) the effect of the net entry of products and taste changes, the latter being particularly strong. Furthermore, differences in the shopping baskets across income groups suggest that inflation varies across the income distribution. We find that when product churn and taste changes are accounted for, ready meals prices rose over the period by around 3% in low-income households compared with a rise of 12% and 14% in middle- and higher-income households, respectively. These issues are important not only for measuring cost-of-living and how it varies across income groups but also in addressing policy issues more generally.</p>","PeriodicalId":55537,"journal":{"name":"American Journal of Agricultural Economics","volume":"108 5","pages":"1300-1323"},"PeriodicalIF":4.9,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ajae.70031","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148910037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Postharvest losses from temperature during transit: Evidence from a million truckloads 运输过程中温度造成的采后损失：来自一百万卡车的证据
IF 4.9 2区 经济学
American Journal of Agricultural Economics Pub Date : 2026-07-02 Epub Date: 2025-10-18 DOI: 10.1111/ajae.70019
Sarah C. Whitnall, Timothy K. M. Beatty
{"title":"Postharvest losses from temperature during transit: Evidence from a million truckloads","authors":"Sarah C. Whitnall,&nbsp;Timothy K. M. Beatty","doi":"10.1111/ajae.70019","DOIUrl":"https://doi.org/10.1111/ajae.70019","url":null,"abstract":"<p>Around 13% of the global food supply is lost along production and supply chains including postharvest losses. We estimate the effect of weather and climate change on postharvest losses from data on 1.4 million truckloads of processing tomatoes in California. Our reduced-form estimation strategy compares processing tomatoes grown in the same field in the same season but experience different weather and traffic conditions during transit. Hot temperatures during transportation damage product quality, particularly when hot temperatures coincide with heavy traffic. When we compare best- and worst-case temperature and traffic conditions, the average rate of damage doubles but the economic effects are modest. We predict climate change will cause a negligible increase in postharvest losses by century's end. We add to prior work focused on farm output with little attention paid to effects of extreme weather and climate change on products after they leave the farm.</p>","PeriodicalId":55537,"journal":{"name":"American Journal of Agricultural Economics","volume":"108 4","pages":"1007-1030"},"PeriodicalIF":4.9,"publicationDate":"2026-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148373510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Geographical indications in international markets: Policy, productivity, and trade 国际市场中的地理标志：政策、生产力和贸易
IF 4.9 2区 经济学
American Journal of Agricultural Economics Pub Date : 2026-07-02 Epub Date: 2025-11-03 DOI: 10.1111/ajae.70027
Jakob Rackl, Luisa Menapace
{"title":"Geographical indications in international markets: Policy, productivity, and trade","authors":"Jakob Rackl,&nbsp;Luisa Menapace","doi":"10.1111/ajae.70027","DOIUrl":"https://doi.org/10.1111/ajae.70027","url":null,"abstract":"<p>Geographical indications (GIs) are an increasingly important feature of global agri-food markets and trade agreements, yet the economic literature lacks a structural open-economy model to analyze how GI policies influence exports, productivity, and welfare. To fill this gap, we develop a general equilibrium model of international trade that captures essential features of GI production and policies in both domestic and international markets. Production features include the craftsmanship of GI products and the collective culture of GI producers. GI policies focus on institutional frameworks and financial support for the collective management of GIs, as well as administrative protection (ex officio protection) of the GI label. The model accommodates cross-country asymmetries in the endowment of GI sectors, as well as in the implementation and strength of GI policies. Through simulation exercises, we analyze the impact of GI policies on production decisions, exporting behavior and market share allocation across the GI and non-GI sectors. We identify welfare-maximizing domestic and international GI policies and unveil a novel mechanism for welfare gains in international markets. This mechanism is driven by the interaction between domestic and international GI policies, leading to an inter-sectoral reallocation of market shares toward firms with higher productivity. Additionally, we formulate empirically testable hypotheses and provide policy recommendations. Our work provides a structural basis for future empirical research on the role of GI policies in shaping export behavior and productivity in global agri-food markets.</p>","PeriodicalId":55537,"journal":{"name":"American Journal of Agricultural Economics","volume":"108 4","pages":"1219-1252"},"PeriodicalIF":4.9,"publicationDate":"2026-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ajae.70027","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148373354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The varying effects of dollar stores on food access: A machine learning analysis 一元店对食物获取的不同影响：机器学习分析
IF 4.9 2区 经济学
American Journal of Agricultural Economics Pub Date : 2026-07-02 Epub Date: 2025-10-31 DOI: 10.1111/ajae.70025
Chuck Grigsby-Calage, Conner Mullally, Richard Volpe, Jaclyn Kropp
{"title":"The varying effects of dollar stores on food access: A machine learning analysis","authors":"Chuck Grigsby-Calage,&nbsp;Conner Mullally,&nbsp;Richard Volpe,&nbsp;Jaclyn Kropp","doi":"10.1111/ajae.70025","DOIUrl":"https://doi.org/10.1111/ajae.70025","url":null,"abstract":"<p>Dollar store proliferation across the United States since the early 2000s has prompted numerous communities to enact policies restricting their growth. Motivated by policy concerns about reduced food access, we investigate whether dollar store entry reduces access to grocery stores, measured by the presence of grocery stores near households. We find significant effects in urban block groups that experience dollar store entry with a single grocery store at baseline, constituting 14% of treated urban block groups from 2006 to 2020. Urban-area impacts are strongly correlated with the Black population share, poverty rate, dependence on public assistance, and levels of vacant housing and vehicle access. Rural-area effects are negligible or zero in our main analyses, though incorporating smaller retailers in our food access definition reveals modest but significant impacts. Food access concerns driving dollar store policies may be valid in specific communities.</p>","PeriodicalId":55537,"journal":{"name":"American Journal of Agricultural Economics","volume":"108 4","pages":"1097-1120"},"PeriodicalIF":4.9,"publicationDate":"2026-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148373642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Revising income eligibility for the national school lunch program: Evidence from indifference scales for households with children 修订国家学校午餐计划的收入资格：来自有孩子家庭的冷漠量表的证据
IF 4.9 2区 经济学
American Journal of Agricultural Economics Pub Date : 2026-07-02 Epub Date: 2025-10-01 DOI: 10.1111/ajae.70014
Wanqi Liang, Yunei Hua, Wenying Li, Jeffrey H. Dorfman
{"title":"Revising income eligibility for the national school lunch program: Evidence from indifference scales for households with children","authors":"Wanqi Liang,&nbsp;Yunei Hua,&nbsp;Wenying Li,&nbsp;Jeffrey H. Dorfman","doi":"10.1111/ajae.70014","DOIUrl":"https://doi.org/10.1111/ajae.70014","url":null,"abstract":"<p>The National School Lunch Program, the largest child nutrition initiative in the United States, provides free or reduced-price lunches to low-income children. However, the current eligibility criteria are based on household-level metrics, potentially causing bias that does not adequately protect children in need. Using data from the US Consumer Expenditure Survey spanning from 2015 to 2022 and the concept of indifference scales, this study develops an alternative eligibility criterion tailored specifically for children. Our results indicate that the eligibility thresholds for free and reduced-price lunches for households with three and four children should be increased by at least 11%, assuming the current threshold for a one-child household is correct. This highlights the broader policy value of adjusting household-based eligibility standards to better reflect individual needs across social programs.</p>","PeriodicalId":55537,"journal":{"name":"American Journal of Agricultural Economics","volume":"108 4","pages":"1076-1096"},"PeriodicalIF":4.9,"publicationDate":"2026-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ajae.70014","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148373340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Market regulation and productivity: The case of the Canadian Wheat Board 市场监管与生产力：以加拿大小麦板为例
IF 4.9 2区 经济学
American Journal of Agricultural Economics Pub Date : 2026-07-02 Epub Date: 2025-10-29 DOI: 10.1111/ajae.70018
Ryan Cardwell, Pascal L. Ghazalian
{"title":"Market regulation and productivity: The case of the Canadian Wheat Board","authors":"Ryan Cardwell,&nbsp;Pascal L. Ghazalian","doi":"10.1111/ajae.70018","DOIUrl":"https://doi.org/10.1111/ajae.70018","url":null,"abstract":"<p>Changes to regulatory environments influence firm-level incentives, which can move the productivity frontier or reposition firms within an existing frontier. Estimating causal effects of policy changes requires a credible counterfactual for productivity in the absence of policy change. We estimate causal effects of a major policy change in agricultural markets; deregulation of the Canadian Wheat Board. The Canadian Wheat Board was a state-trading enterprise that controlled sale and distribution of wheat and barley produced in Western Canada through a single-desk monopsony from 1943 to 2012. We investigate how deregulation affected farm-level productivity for regulated crops. Field-level production and input data for 13,000 farms over 17 years are used to generate a within-farm difference-in-differences estimate of how relative productivity changed between regulated and unregulated crops when the single-desk mandate was removed. Our within-farm approach identifies the effects of regime change while controlling for factors that confound productivity estimation in other approaches, including unobserved time-varying factors at the farm level. We identify significant positive effects of deregulation on farm-level productivity of spring wheat. We also find heterogeneous effects across fields with different land productivity, and across farms with different levels of experience marketing their unregulated crops outside the single-desk. Broadly, we find that deregulation of the Canadian Wheat Board's monopsonistic single desk incentivized farms to increase productivity of wheat. This research contributes to the understanding of how policy interventions can affect firm-level productivity, and to the productivity literature with an estimation strategy for identifying productivity effects in the context of multi-output firms.</p>","PeriodicalId":55537,"journal":{"name":"American Journal of Agricultural Economics","volume":"108 4","pages":"1193-1218"},"PeriodicalIF":4.9,"publicationDate":"2026-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ajae.70018","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148373551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Household migration in response to climate and severe weather: Heterogeneous sorting and the rural–urban divide 应对气候和恶劣天气的家庭迁移：异质性分类和城乡分化
IF 4.9 2区 经济学
American Journal of Agricultural Economics Pub Date : 2026-07-02 Epub Date: 2025-09-28 DOI: 10.1111/ajae.70016
Jarron VanCeylon, Richard T. Melstrom
{"title":"Household migration in response to climate and severe weather: Heterogeneous sorting and the rural–urban divide","authors":"Jarron VanCeylon,&nbsp;Richard T. Melstrom","doi":"10.1111/ajae.70016","DOIUrl":"https://doi.org/10.1111/ajae.70016","url":null,"abstract":"<p>This paper investigates rural–urban climate disparities by analyzing household moves in response to severe weather events along the U.S. East Coast. Using a longitudinal sorting model, we assess migration following Federal Emergency Management Agency disaster declarations and find that household willingness to pay to avoid disasters differs between urban and rural areas. Specifically, households are willing to pay approximately $925 to avoid urban areas affected by hurricanes and $1072 to avoid rural areas affected by floods. Additionally, we find partial evidence that migration responses differ between White and Black/Hispanic households. These findings highlight the importance of understanding climate adaptation disparities across racial and ethnic groups, providing insights into equitable disaster aid and climate resilience strategies.</p>","PeriodicalId":55537,"journal":{"name":"American Journal of Agricultural Economics","volume":"108 4","pages":"1031-1047"},"PeriodicalIF":4.9,"publicationDate":"2026-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148373636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Japanese wild boars head north: Snow depth decrease, wildlife conflict, and structural changes in agriculture 日本野猪向北迁移：积雪深度减少，野生动物冲突，农业结构变化
IF 4.9 2区 经济学
American Journal of Agricultural Economics Pub Date : 2026-07-02 Epub Date: 2025-10-16 DOI: 10.1111/ajae.70024
Taisuke Takayama, Kota Mameno, Takeshi Fujie, Tetsuji Senda, Shota Mochizuki, Akira Hibiki, Masahiro Takano
{"title":"Japanese wild boars head north: Snow depth decrease, wildlife conflict, and structural changes in agriculture","authors":"Taisuke Takayama,&nbsp;Kota Mameno,&nbsp;Takeshi Fujie,&nbsp;Tetsuji Senda,&nbsp;Shota Mochizuki,&nbsp;Akira Hibiki,&nbsp;Masahiro Takano","doi":"10.1111/ajae.70024","DOIUrl":"https://doi.org/10.1111/ajae.70024","url":null,"abstract":"<p>Human–wildlife conflicts, specifically the damage caused to crops and livestock, pose a significant challenge that affects agriculture. Climate change has exacerbated this issue by altering the distribution and behavior of wildlife. This study examines how farmers respond to the increasing encroachment of Japanese wild boars on farmlands, using panel data at the farm level. The study exploits the expansion of wild boar habitats owing to reduced snow depth. The results show that the presence of wild boars leads to farm exits. In addition, we observe a negative effect on farm size. These effects are driven by an increase in abandoned farmland and a decrease in rented-in farmland. The findings suggest that human–wildlife conflicts hinder structural changes in agriculture.</p>","PeriodicalId":55537,"journal":{"name":"American Journal of Agricultural Economics","volume":"108 4","pages":"1171-1192"},"PeriodicalIF":4.9,"publicationDate":"2026-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148373476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Field-level crop choice responses to weather-induced yield shocks in the US Corn Belt 美国玉米带田间作物选择对天气引起的产量冲击的响应
IF 4.9 2区 经济学
American Journal of Agricultural Economics Pub Date : 2026-07-02 Epub Date: 2025-10-19 DOI: 10.1111/ajae.70013
Seunghyun Lee
{"title":"Field-level crop choice responses to weather-induced yield shocks in the US Corn Belt","authors":"Seunghyun Lee","doi":"10.1111/ajae.70013","DOIUrl":"https://doi.org/10.1111/ajae.70013","url":null,"abstract":"<p>As climate change increases the frequency and severity of extreme heat events, farmers are expected to face greater variability in crop yields. Using 10 million field-level observations, this study examines how farmers in the US Corn Belt adjust corn–soybean rotation decisions in response to yield shocks largely driven by weather fluctuations. The findings suggest that farmers tend to shift toward soybeans, which are more heat-tolerant than corn, after a hotter-than-normal growing season, regardless of which crop experienced greater yield loss. However, I find little evidence of effective adaptation: years in which farmers plant more soybeans are not, on average, hotter than usual. Moreover, shocks that occurred more than 1 year prior have substantially smaller effects than the most recent shock. This pattern is consistent with recency bias, whereby farmers place disproportionate weight on recent experiences when making decisions. Overall, the results suggest that short-term weather shocks can have lingering effects on land-use decisions in commercial agricultural systems, with important implications for both agricultural production and environmental outcomes such as water quality.</p>","PeriodicalId":55537,"journal":{"name":"American Journal of Agricultural Economics","volume":"108 4","pages":"1048-1075"},"PeriodicalIF":4.9,"publicationDate":"2026-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ajae.70013","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148373555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Food without fire: Environmental and nutritional impacts from a solar stove field experiment 没有火的食物：太阳能炉田间试验对环境和营养的影响
IF 4.9 2区 经济学
American Journal of Agricultural Economics Pub Date : 2026-07-02 Epub Date: 2025-11-05 DOI: 10.1111/ajae.70026
Laura E. McCann, Jeffrey D. Michler, Maybin Mwangala, Osaretin Olurotimi, Natalia Estrada Carmona
{"title":"Food without fire: Environmental and nutritional impacts from a solar stove field experiment","authors":"Laura E. McCann,&nbsp;Jeffrey D. Michler,&nbsp;Maybin Mwangala,&nbsp;Osaretin Olurotimi,&nbsp;Natalia Estrada Carmona","doi":"10.1111/ajae.70026","DOIUrl":"https://doi.org/10.1111/ajae.70026","url":null,"abstract":"<p>Over 80% of the population in rural Sub-Saharan Africa relies on biomass cooking fuel, a substantial source of anthropogenic greenhouse gases. We use a field experiment in Zambia to investigate the impact of solar stoves on biomass fuel use and cooking habits. Participants kept detailed food diaries, recording every ingredient and fuel source used in preparing every dish in every meal every day during the experiment. This produces data on 93,000 ingredients used to prepare 30,000 dishes. Treated households significantly reduce biomass fuel use, cutting emissions by 3–7%, but do not significantly change cooking habits.</p>","PeriodicalId":55537,"journal":{"name":"American Journal of Agricultural Economics","volume":"108 4","pages":"1121-1144"},"PeriodicalIF":4.9,"publicationDate":"2026-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ajae.70026","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148373097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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