A Triple‐Hurdle Model of Production and Market Participation in Kenya's Dairy Market
提出一个“三重障碍”模型，分析肯尼亚小农是否参与乳制品生产以及是否进入市场，发现农村电气化、培训和改善放牧实践是关键因素，且非正式私人市场能显著提高预期净销售额。
Existing analyses of market participation are based on a “double‐hurdle” modeling approach. Such models are appropriate only when all members of the population of interest actually produce the good. In some contexts, however (e.g., smallholder farmers), many members of the population do not produce particular goods that they could produce and that their neighbors do produce. Policies influencing market participation among producers may thus also induce additional farmers to become producers. Previous double‐hurdle approaches do not allow explicitly for this possibility. To address these limitations, this article presents a “triple‐hurdle” approach with an initial stage that includes nonproducers. The model is used to identify the factors associated with Kenyan smallholder farmers choosing to participate in dairy production, and the role that these producers choose to play (or not) in the marketplace. In the midst of debates underway over the privatization of the parastatal Kenya Creameries Company, new knowledge about smallholder participation in dairy could be an important contribution. Results suggest the importance of rural electrification, training, and improved grazing practices. We find that expected net sales are significantly higher when farmers have access to informal private markets. We also describe a version of the ordered tobit model that includes nonproducers and is nested in our triple‐hurdle model. A likelihood ratio test shows the latter to be a significantly better fit to our data. We discuss how insights gained from this study differ from the insights that would come from a double‐hurdle ordered tobit that also includes nonproducers.