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Heterogeneous Demand and Supply for an Insurance‐linked Credit Product in Kenya: A Stated Choice Experiment Approach

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  • Apurba Shee
  • Calum G. Turvey
  • Ana Marr

Abstract

We employ a discrete choice experiment to elicit demand and supply side preferences for insurance‐linked credit, a promising market‐based tool for managing agricultural weather risks and providing access to credit for farmers. We estimate preference heterogeneity using primary data from smallholder farmers and managers of lenders/insurers combined with household socio‐economic survey data in Kenya. We analyse the choice data using maximum simulated likelihood and Hierarchical Bayes estimation of a mixed logit model. Although there are some similarities, we find that there is conflicting demand and supply side preferences for credit terms, collateral requirements, and loan use flexibility. We also analyse willingness to buy and willingness to offer for farmers and suppliers, respectively, for the risk premium for different attributes and their levels. Identifying the preferred attributes and levels for both farmers and financial institutions can guide optimal packaging of insurance and credit providing market participation and adoption motivation for insurance‐bundled credit product.

Suggested Citation

  • Apurba Shee & Calum G. Turvey & Ana Marr, 2021. "Heterogeneous Demand and Supply for an Insurance‐linked Credit Product in Kenya: A Stated Choice Experiment Approach," Journal of Agricultural Economics, Wiley Blackwell, vol. 72(1), pages 244-267, February.
    • Handle: RePEc:bla:jageco:v:72:y:2021:i:1:p:244-267
    DOI: 10.1111/1477-9552.12401
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    1. Ward, Patrick S. & Ortega, David L. & Spielman, David J. & Singh, Vartika, 2014. "Heterogeneous Demand for Drought-Tolerant Rice: Evidence from Bihar, India," World Development, Elsevier, vol. 64(C), pages 125-139.
    2. Petri Liesivaara & Sami Myyrä, 2014. "Willingness to pay for agricultural crop insurance in the northern EU," Agricultural Finance Review, Emerald Group Publishing Limited, vol. 74(4), pages 539-554, October.
    3. Wiktor Adamowicz & Peter Boxall & Michael Williams & Jordan Louviere, 1998. "Stated Preference Approaches for Measuring Passive Use Values: Choice Experiments and Contingent Valuation," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 80(1), pages 64-75.
    4. Dean Karlan & Robert Osei & Isaac Osei-Akoto & Christopher Udry, 2014. "Agricultural Decisions after Relaxing Credit and Risk Constraints," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 129(2), pages 597-652.
    5. Apurba Shee & Calum G. Turvey, 2012. "Collateral-free lending with risk-contingent credit for agricultural development: indemnifying loans against pulse crop price risk in India," Agricultural Economics, International Association of Agricultural Economists, vol. 43(5), pages 561-574, September.
    6. Ana Marr & Anne Winkel & Marcel van Asseldonk & Robert Lensink & Erwin Bulte, 2016. "Adoption and impact of index-insurance and credit for smallholder farmers in developing countries," Agricultural Finance Review, Emerald Group Publishing Limited, vol. 76(1), pages 94-118, May.
    7. David L. Ortega & H. Holly Wang & Nicole J. Olynk & Laping Wu & Junfei Bai, 2012. "Chinese Consumers' Demand for Food Safety Attributes: A Push for Government and Industry Regulations," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 94(2), pages 489-495.
    8. Bliemer, Michiel C.J. & Rose, John M., 2010. "Construction of experimental designs for mixed logit models allowing for correlation across choice observations," Transportation Research Part B: Methodological, Elsevier, vol. 44(6), pages 720-734, July.
    9. Benjamin Collier & Ani L. Katchova & Jerry R. Skees, 2011. "Loan portfolio performance and El Niño, an intervention analysis," Agricultural Finance Review, Emerald Group Publishing Limited, vol. 71(1), pages 98-119, May.
    10. Carlsson, Fredrik & Martinsson, Peter, 2001. "Do Hypothetical and Actual Marginal Willingness to Pay Differ in Choice Experiments?: Application to the Valuation of the Environment," Journal of Environmental Economics and Management, Elsevier, vol. 41(2), pages 179-192, March.
    11. Vicki L. Bogan & Calum G. Turvey & Gabriela Salazar, 2015. "The Elasticity of Demand for Microcredit: Evidence from Latin America," Development Policy Review, Overseas Development Institute, vol. 33(6), pages 725-757, November.
    12. Apurba Shee & Calum G. Turvey & Joshua Woodard, 2015. "A field study for assessing risk-contingent credit for Kenyan pastoralists and dairy farmers," Agricultural Finance Review, Emerald Group Publishing Limited, vol. 75(3), pages 330-348, September.
    13. Nathaniel Jensen & Christopher Barrett, 2017. "Agricultural Index Insurance for Development," Applied Economic Perspectives and Policy, Agricultural and Applied Economics Association, vol. 39(2), pages 199-219.
    14. Rob W. Fraser, 1992. "An Analysis Of Willingness‐To‐Pay For Crop Insurance," Australian Journal of Agricultural and Resource Economics, Australian Agricultural and Resource Economics Society, vol. 36(1), pages 83-95, April.
    15. Farrin, Katie & Miranda, Mario J., 2015. "A heterogeneous agent model of credit-linked index insurance and farm technology adoption," Journal of Development Economics, Elsevier, vol. 116(C), pages 199-211.
    16. Carter, Michael R. & Cheng, Lan & Sarris, Alexandros, 2016. "Where and how index insurance can boost the adoption of improved agricultural technologies," Journal of Development Economics, Elsevier, vol. 118(C), pages 59-71.
    17. Basu, Arnab K. & Hicks, Robert L., 2008. "Label Performance and the Willingness to Pay for Fair Trade Coffee: A Cross-National Perspective," Discussion Papers 44336, University of Bonn, Center for Development Research (ZEF).
    18. Ward, Patrick S. & Makhija, Simrin, 2018. "New modalities for managing drought risk in rainfed agriculture: Evidence from a discrete choice experiment in Odisha, India," World Development, Elsevier, vol. 107(C), pages 163-175.
    19. David Revelt & Kenneth Train, 1998. "Mixed Logit With Repeated Choices: Households' Choices Of Appliance Efficiency Level," The Review of Economics and Statistics, MIT Press, vol. 80(4), pages 647-657, November.
    20. Arne Risa Hole, 2007. "Fitting mixed logit models by using maximum simulated likelihood," Stata Journal, StataCorp LP, vol. 7(3), pages 388-401, September.
    21. Abhijit V. Banerjee & Esther Duflo, 2014. "Do Firms Want to Borrow More? Testing Credit Constraints Using a Directed Lending Program," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 81(2), pages 572-607.
    22. Leslie J. Verteramo Chiu & Sivalai V. Khantachavana & Calum G. Turvey, 2014. "Risk rationing and the demand for agricultural credit: a comparative investigation of Mexico and China," Agricultural Finance Review, Emerald Group Publishing Limited, vol. 74(2), pages 248-270, July.
    23. Paulo Santos & Christopher B. Barrett, 2017. "Heterogeneous Wealth Dynamics: On the Roles of Risk and Ability," NBER Chapters, in: The Economics of Poverty Traps, pages 265-290, National Bureau of Economic Research, Inc.
    24. Mario J. Miranda & Katie Farrin, 2012. "Index Insurance for Developing Countries," Applied Economic Perspectives and Policy, Agricultural and Applied Economics Association, vol. 34(3), pages 391-427.
    25. Boucher, Stephen R. & Carter, Michael R. & Guirkinger, Catherine, 2008. "AJAE Appendix: Risk Rationing and Wealth Effects in Credit Markets: Theory and Implications for Agriculture Development," American Journal of Agricultural Economics APPENDICES, Agricultural and Applied Economics Association, vol. 90(2), pages 1-6.
    26. Kelvin J. Lancaster, 1966. "A New Approach to Consumer Theory," Journal of Political Economy, University of Chicago Press, vol. 74(2), pages 132-132.
    27. Jorien Veldwijk & Mattijs S Lambooij & Esther W de Bekker-Grob & Henriëtte A Smit & G Ardine de Wit, 2014. "The Effect of Including an Opt-Out Option in Discrete Choice Experiments," PLOS ONE, Public Library of Science, vol. 9(11), pages 1-9, November.
    28. Jayson L. Lusk & Ted C. Schroeder, 2004. "Are Choice Experiments Incentive Compatible? A Test with Quality Differentiated Beef Steaks," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 86(2), pages 467-482.
    29. Jerry R. Skees & Jason Hartell & Anne G. Murphy, 2007. "Using Index-Based Risk Transfer Products to Facilitate Micro Lending in Peru and Vietnam," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 89(5), pages 1255-1261.
    30. Ron Weber & Oliver Musshoff, 2013. "Can flexible microfinance loans improve credit access for farmers?," Agricultural Finance Review, Emerald Group Publishing Limited, vol. 73(2), pages 255-271, July.
    31. Fraser, Rob W., 1992. "An Analysis Of Willingness-To-Pay For Crop Insurance," Australian Journal of Agricultural Economics, Australian Agricultural and Resource Economics Society, vol. 36(1), pages 1-13, April.
    32. Steven D. Hanson & Robert J. Myers & J. Roy Black, 1998. "The Effects of Crop Yield Insurance Designs on Farmer Participation and Welfare," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 80(4), pages 806-820.
    33. Lorenzo Casaburi & Jack Willis, 2018. "Time versus State in Insurance: Experimental Evidence from Contract Farming in Kenya," American Economic Review, American Economic Association, vol. 108(12), pages 3778-3813, December.
    34. Peter J. Barry & C. B. Baker & Luis R. Sanint, 1981. "Farmers' Credit Risks and Liquidity Management," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 63(2), pages 216-227.
    35. Corey Lesk & Pedram Rowhani & Navin Ramankutty, 2016. "Influence of extreme weather disasters on global crop production," Nature, Nature, vol. 529(7584), pages 84-87, January.
    36. Bester, Helmut, 1985. "Screening vs. Rationing in Credit Markets with Imperfect Information," American Economic Review, American Economic Association, vol. 75(4), pages 850-855, September.
    37. Richard A. Gallenstein & Khushbu Mishra & Abdoul G. Sam & Mario J. Miranda, 2019. "Willingness to Pay for Insured Loans in Northern Ghana," Journal of Agricultural Economics, Wiley Blackwell, vol. 70(3), pages 640-662, September.
    38. Ruth Vargas Hill & John Hoddinott & Neha Kumar, 2013. "Adoption of weather-index insurance: learning from willingness to pay among a panel of households in rural Ethiopia," Agricultural Economics, International Association of Agricultural Economists, vol. 44(4-5), pages 385-398, July.
    39. Ying (Jessica) Cao & Calum Turvey & Jiujie Ma & Rong Kong & Guangwen He & Jubo Yan, 2016. "Incentive mechanisms, loan decisions and policy rationing," Agricultural Finance Review, Emerald Group Publishing Limited, vol. 76(3), pages 326-347, September.
    40. Abhijit Banerjee & Dean Karlan & Jonathan Zinman, 2015. "Six Randomized Evaluations of Microcredit: Introduction and Further Steps," American Economic Journal: Applied Economics, American Economic Association, vol. 7(1), pages 1-21, January.
    41. Myyrä, Sami & Liesivaara, Petri, 2014. "Willingness to pay for agricultural yield insurance is affected by starting point bias," 2014 International Congress, August 26-29, 2014, Ljubljana, Slovenia 182855, European Association of Agricultural Economists.
    42. Jie Yu & Peter Goos & Martina Vandebroek, 2009. "Efficient Conjoint Choice Designs in the Presence of Respondent Heterogeneity," Marketing Science, INFORMS, vol. 28(1), pages 122-135, 01-02.
    43. Christopher B. Barrett & Michael R. Carter, 2013. "The Economics of Poverty Traps and Persistent Poverty: Empirical and Policy Implications," Journal of Development Studies, Taylor & Francis Journals, vol. 49(7), pages 976-990, July.
    44. Stephen R. Boucher & Catherine Guirkinger & Carolina Trivelli, 2009. "Direct Elicitation of Credit Constraints: Conceptual and Practical Issues with an Application to Peruvian Agriculture," Economic Development and Cultural Change, University of Chicago Press, vol. 57(4), pages 609-640, July.
    45. Christopher Barrett & Michael Carter & Peter Little, 2006. "Understanding and reducing persistent poverty in Africa: Introduction to a special issue," Journal of Development Studies, Taylor & Francis Journals, vol. 42(2), pages 167-177.
    46. Jayson L. Lusk & Jutta Roosen & John A. Fox, 2003. "Demand for Beef from Cattle Administered Growth Hormones or Fed Genetically Modified Corn: A Comparison of Consumers in France, Germany, the United Kingdom, and the United States," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 85(1), pages 16-29.
    47. Sonia Akter & Roy Brouwer & Saria Choudhury & Salina Aziz, 2009. "Is there a commercially viable market for crop insurance in rural Bangladesh?," Mitigation and Adaptation Strategies for Global Change, Springer, vol. 14(3), pages 215-229, March.
    48. John Rose & Michiel Bliemer, 2013. "Sample size requirements for stated choice experiments," Transportation, Springer, vol. 40(5), pages 1021-1041, September.
    49. Richard C. Ready & Patricia A. Champ & Jennifer L. Lawton, 2010. "Using Respondent Uncertainty to Mitigate Hypothetical Bias in a Stated Choice Experiment," Land Economics, University of Wisconsin Press, vol. 86(2), pages 363-381.
    50. Jayson L. Lusk & F. Bailey Norwood & J. Ross Pruitt, 2006. "Consumer Demand for a Ban on Antibiotic Drug Use in Pork Production," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 88(4), pages 1015-1033.
    51. Stephen R. Boucher & Michael R. Carter & Catherine Guirkinger, 2008. "Risk Rationing and Wealth Effects in Credit Markets: Theory and Implications for Agricultural Development," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 90(2), pages 409-423.
    52. Daniel McFadden & Kenneth Train, 2000. "Mixed MNL models for discrete response," Journal of Applied Econometrics, John Wiley & Sons, Ltd., vol. 15(5), pages 447-470.
    53. Turvey, Calum G. & He, Guangwen & MA, Jiujie & Kong, Rong & Meagher, Patrick, 2012. "Farm credit and credit demand elasticities in Shaanxi and Gansu," China Economic Review, Elsevier, vol. 23(4), pages 1020-1035.
    54. Dean Karlan & Ed Kutsoati & Margaret McMillan & Chris Udry, 2011. "Crop Price Indemnified Loans for Farmers: A Pilot Experiment in Rural Ghana," Journal of Risk & Insurance, The American Risk and Insurance Association, vol. 78(1), pages 37-55, March.
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    JEL classification:

    • Q11 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Agriculture - - - Aggregate Supply and Demand Analysis; Prices
    • Q14 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Agriculture - - - Agricultural Finance
    • Q18 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Agriculture - - - Agricultural Policy; Food Policy; Animal Welfare Policy

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