{"type":"script","doc_desc":{"producers":[{"name":"Reproducibility WBG","abbr":"DECDI","affiliation":"World Bank - Development Impact Department","role":"Verification and preparation of metadata"}],"prod_date":"2026-03-17","version":"1"},"project_desc":{"authoring_entity":[{"name":"Atsushi Iimi","affiliation":"World Bank","email":"aiimi@worldbank.org"}],"title_statement":{"title":"Reproducibility package for Transport Accessibility And Food Price Differentials: A New Era Of Mining Development In Guinea","idno":"RR_GIN_2026_582"},"software":[{"name":"Stata","version":"19.5 MP"},{"name":"ArcGIS Pro","version":"3.5.3"}],"scripts":[{"title":"Reproducibility package for Transport Accessibility And Food Price Differentials: A New Era Of Mining Development In Guinea","date":"2026-03","notes":"Computational reproducibility verified by Development Impact (DECDI) Analytics team, World Bank.","instructions":"See README in reproducibility package.","file_name":"RR_GIN_2026_582","zip_package":"RR_GIN_2026_582.zip"}],"repository_uri":[{"name":"Reproducible Research Repository (World Bank)","uri":"https:\/\/reproducibility.worldbank.org"}],"production_date":"2026-03-17","abstract":"The paper casts light on challenges and opportunities of large-scale mining development, particularly in connection to local market integration, food security, and transport infrastructure development. Using unique road condition and food price data from Guinea, the paper applies the Law of One Price framework with iceberg transport costs and examines how intercity connectivity impacts on food price differentials among local markets. In Guinea, the Simandou 2040 Program, a major iron ore project, has increased heavy vehicle traffic in the late 2010s, deteriorating road conditions and raising transport costs, which in turn affect food price disparities across regions. The elasticity of price differentials with respect to travel time is estimated at 0.05 to 0.06. In particular, perishable commodities, such as fish, chili, and eggplants, show higher elasticity. The findings confirm the importance of well-connected intercity transportation to improve efficiency in local food markets, assure food security, and promote inclusive agriculture growth in remote areas. The evidence also indicates growth opportunities to promote agribusinesses and logistics in secondary cities because perishable commodities are found to be particularly vulnerable to intercity connectivity.\n\n","geographic_units":[{"name":"Guinea","code":"GIN"}],"keywords":[{"name":"Food Prices"},{"name":"Transport Accessibility"},{"name":"Gravity Models"}],"topics":[{"id":"C23","uri":"https:\/\/www.aeaweb.org\/econlit\/jelCodes.php?view=jel","vocabulary":"Journal of Economic Literature (JEL)","name":"Panel Data Models \u2022 Spatio-temporal Models","parent_id":"C2"},{"id":" C24","uri":"https:\/\/www.aeaweb.org\/econlit\/jelCodes.php?view=jel","vocabulary":"Journal of Economic Literature (JEL)","name":"Truncated and Censored Models \u2022 Switching Regression Models \u2022 Threshold Regression Models","parent_id":"C2"},{"id":" O13","uri":"https:\/\/www.aeaweb.org\/econlit\/jelCodes.php?view=jel","vocabulary":"Journal of Economic Literature (JEL)","name":"Agriculture \u2022 Natural Resources \u2022 Energy \u2022 Environment \u2022 Other Primary Products","parent_id":"O1"},{"id":" O18","uri":"https:\/\/www.aeaweb.org\/econlit\/jelCodes.php?view=jel","vocabulary":"Journal of Economic Literature (JEL)","name":"Urban, Rural, Regional, and Transportation Analysis \u2022 Housing \u2022 Infrastructure","parent_id":"O1"}],"output":[{"type":"Working Paper","description":"Policy Research Working Papers (PRWP)","title":"Transport Accessibility And Food Price Differentials: A New Era Of Mining Development In Guinea"}],"language":[{"name":"English","code":"EN"}],"technology_requirements":"Runtime: 5 minutes","disclaimer":"The materials in the reproducibility packages are distributed as they were prepared by the staff of the International Bank for Reconstruction and Development\/The World Bank. The findings, interpretations, and conclusions expressed in this event do not necessarily reflect the views of the World Bank, the Executive Directors of the World Bank, or the governments they represent. The World Bank does not guarantee the accuracy of the materials included in the reproducibility package.","license":[{"name":"Modified BSD3","uri":"https:\/\/opensource.org\/license\/bsd-3-clause\/"}],"contacts":[{"name":"Atsushi Iimi","affiliation":"World Bank","email":"aiimi@worldbank.org"},{"name":"Reproducibility WBG","affiliation":"World Bank","email":"reproducibility@worldbank.org"}],"datasets":[{"uri":"https:\/\/data.humdata.org\/dataset\/wfp-food-prices-for-guinea","name":"Guinea - Food Prices","note":"Source: World Food Programme Price Database","license":"Creative Commons Attribution 4.0","license_uri":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/legalcode","access_type":"Data is publicly available and included in the reproducibility package.","citation":"World Food Programme Price Database. 2026. \"Guinea - Food Prices [dataset],\" https:\/\/data.humdata.org\/dataset\/wfp-food-prices-for-guinea."},{"name":"Guinea Cities and Population Spatial Data","note":"Source: World Cities Database by MIT","uri":"https:\/\/simplemaps.com\/data\/gn-cities","license_uri":"https:\/\/opensource.org\/license\/MIT","access_type":"Data is publicly available and included in the reproducibility package.","license":"MIT License","citation":"World Cities Database by MIT. 2025. \"Guinea Cities and Population Spatial Data [dataset],\" https:\/\/simplemaps.com\/data\/gn-cities."},{"name":"Agriculture production value data","uri":"https:\/\/www.mapspam.info\/","note":"Source: Spatial Production Allocation Model (SPAM)","access_type":"Data is publicly available and included in the reproducibility package.","citation":"World Cities Database by MIT. 2025. \"Guinea City Shapefiles [dataset],\" https:\/\/simplemaps.com\/data\/gn-cities.","license_uri":"https:\/\/creativecommons.org\/licenses\/by-nc\/3.0\/","license":"CC BY-NC 3.0"},{"license_uri":"https:\/\/www.imf.org\/en\/about\/copyright-and-terms#data","name":"Guinea - Consumer Price Index data ","note":"Source: International Monetary Fund (IMF)","access_type":"Data is publicly available and included in the reproducibility package.","uri":"https:\/\/data.imf.org\/en\/Data-Explorer?datasetUrn=IMF.STA:CPI(5.0.0)","citation":"International Monetary Fund (IMF). \"Guinea - Consumer Price Index data [dataset],\" https:\/\/data.imf.org\/en\/Data-Explorer?datasetUrn=IMF.STA:CPI(5.0.0)"}],"reproduction_instructions":"To reproduce the findings in this paper, a user must:\n1. **Adjust file paths and run the code**: Update the directory specified in line 3 of `main.do` and run the script. Figures and tables will be generated in the `output` folder.\n2. **Generate maps using ArcGIS**: Refer to the README for detailed instructions on reproducing the maps presented in the paper using ArcGIS.\nNote: The package includes a Python log file documenting the generation of OD_WFP_to_WFP_by_TC_2024.shp and OD_WFP_to_WFP_by_TC_2018.shp, including travel time, distance, and transport cost. The corresponding intermediate data are provided in the package; therefore, users are not required to run the Python code.","technology_environment":"Paper exhibits were reproduced on a computer with the following specifications:\n\u2022 OS: Windows 11 Enterprise\n\u2022 Processor: Intel(R) Xeon(R) Gold 6226R CPU @ 2.90GHz\n\u2022 Memory available: 16.0 GB","data_statement":"All data sources are publicly available and included in the reproducibility package."},"tags":[{"tag":"DOI"},{"tag":"Open Code"},{"tag":"Open data"}],"schematype":"script"}