Input elasticities and agricultural productivity in the Mediterranean: A North–South economic comparison

• BOUAZZA ELAMINE ZEMRI ^[1]
  1. [1] Department of Economic, POLDEVA Laboratory, University of Tlemcen, Algeria
• Localización: New medit: Mediterranean journal of economics, agriculture and environment = Revue méditerranéenne d'economie, agriculture et environment, ISSN 1594-5685, Vol. 25, Nº. 2, 2026, págs. 69-81
• Idioma: inglés
• DOI: 10.30682/nm2602d
• Enlaces
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• Resumen

  • This study estimates how fertilizer intensity, mechanization, and agricultural water dependence relate to agricultural value added in the Mediterranean, and whether marginal effects differ between North (France, Spain, Portugal) and South (Algeria, Egypt, Tunisia). Using a harmonized annual panel (2000-2024), a two-way fixed-effects production model is estimated with Driscoll–Kraay standard errors. Agricultural value added is in logs; fertilizer and tractor density enter in logs (elasticities), while water dependence (agriculture’s share of freshwater withdrawals) enters in levels (semi-elasticity). Baseline estimates show positive elasticities for fertilizer and mechanization. Allowing for water-dependence curvature and water–input interactions indicates diminishing marginal associations in water dependence and weaker marginal returns to fertilizer and mechanization at higher dependence, with economically meaningful North–South heterogeneity in mechanization responses. The results imply that input policies should be tailored to water regimes and regional production structures, and paired with water-efficiency measures where dependence is high.

• Referencias bibliográficas
  • Abis S., Demurtas L., 2023. Food security: the Mediterrean region’s desynchronize agenda. New Medit, 22(2): 3-11. https://doi.org/10.30682/nm2302.
  • Aslam M.F., Masia S., Spano D., Mereu V., Debolini M., Snyder R.L., Borgo A., Trabucco A., 2025. Modelling crop water demand under climate...
  • Benmehaia A.M., Bekkis S., 2024. Agri-food policy trends in Algeria: Selected explorations. New Medit, 23(3): 49-62. https://doi.org/10.30682/nm2403d.
  • Buttinelli R., Dono G., Cortignani R., 2025. Assessing the impacts of chemicals reduction on arable farms through an integrated agro-economic...
  • Chiarelli D.D., Nanesha H., Sardo M., Ragkos A., Rulli M.C., 2025. Water-saving driven crop reallocation reduces irrigation energy demand...
  • Claro A.M., Fonseca A., Fraga H., Santos J.A., 2024. Future agricultural water availability in Mediterranean Countries under climate change:...
  • Daum T., Birner R., 2020. Agricultural mechanization in Africa: Myths, realities and an emerging research agenda. Global Food Security, 26:...
  • Driscoll J.C., Kraay A.C., 1998. Consistent Covariance Matrix Estimation with Spatially Dependent Panel Data. The Review of Economics and...
  • Drobinski P., Rivera Ferre M.G., Monem M.A., Hatab A.A., Behnassi M., Chfadi T., Cramer W., Debolini M., Driouech F., El-Kenawy A., 2025....
  • Eekhout J.P., Delsman I., Baartman J., van Eupen M., Van Haren C., Contreras S., Martínez-López J., De Vente J., 2024. How future changes...
  • Elias G., Majdalani G., Renard D., Faour G., Mouillot F., 2025. Multiple asynchronous drought facets drive Mediterranean natural and cultivated...
  • FAO (Food & Agriculture Organization of the United Nations), 2024. AQUASTAT: FAO’s Global Information System on Water and Agriculture—Water...
  • Garau E., de Abreu G., Pérez-Ramírez I., Schütze N., Farhat Y., El Moussaoui H., Loureiro J., Mahjoub O., Slimane A.B., Amami H., 2025. Exploring...
  • Griliches Z., 1979. Issues in assessing the contribution of research and development to productivity growth. The Bell Journal of Economics,...
  • Hall B.H., Mairesse J., Mohnen P., 2010. Measuring the returns to R&D. In: Handbook of the Economics of Innovation (vol. 2, pp. 1033-1082)....
  • Hamilton S.F., Richards T.J., Shafran A.P., Vasilaky K.N., 2022. Farm labor productivity and the impact of mechanization. American Journal...
  • Li J., Ma W., Botero-R.J.C., Quoc Luu P., 2024. Mechanization in land preparation and irrigation water productivity: insights from rice production....
  • McArthur J.W., McCord G.C., 2017. Fertilizing growth: Agricultural inputs and their effects in economic development. Journal of Development...
  • Mundlak Y., Butzer R., Larson D.F., 2012. Heterogeneous technology and panel data: The case of the agricultural production function. Journal...
  • Palatnik R.R., Raviv O., Sirota J., Shechter M., 2025. Water scarcity and food security in the mediterranean region: The role of alternative...
  • Pérez-Lucas G., Navarro G., Navarro S., 2024. Adapting agriculture and pesticide use in Mediterranean regions under climate change scenarios:...
  • Puy A., Linga S.N., Wei N., Flinders S., Callow B., Allen G., Cross B., Aguiló-Rivera C., Lankford B., 2025. Widely cited global irrigation...
  • Saadi S., Todorovic M., Tanasijevic L., Pereira L.S., Pizzigalli C., Lionello P., 2015. Climate change and Mediterranean agriculture: Impacts...
  • Serrano A., Cazcarro I., Martín-Retortillo M., Rodríguez-López G., 2024. Europe’s orchard: The role of irrigation on the Spanish agricultural...
  • Vogelsang T.J., 2012. Heteroskedasticity, autocorrelation, and spatial correlation robust inference in linear panel models with fixed-effects....
  • Vos R., Glauber J., Hebebrand C., Rice B., 2025. Global shocks to fertilizer markets: Impacts on prices, demand and farm profitability. Food...
  • Wooldridge J., 2021. Panel data with large T and small N. Statalist: The Stata Forum. https://www.statalist.org/forums/forum/general-stata-discussion/general/1592580-panel-data-with-large-t-and-small-n.
  • Wooldridge J.M., 2010. Econometric analysis of cross section and panel data. Cambridge, MA: MIT press. https://www.jstor.org/stable/j.ctt5hhcfr.
  • World Bank, 2025a. Annual freshwater withdrawals, agriculture (% of total freshwater withdrawal) (Indicator: ER.H2O.FWAG.ZS) (World Bank....
  • World Bank, 2025b. Metadata: Annual freshwater withdrawals, agriculture (% of total freshwater withdrawal) (Indicator: ER.H2O.FWAG.ZS) (World...
  • World Bank, 2025c. World Development Indicators (WDI) DataBank report (World Bank). https://databank.worldbank.org/id/650d1cc3?Report_Name=World-development-indicators-2025.