All the CSAs in our sample differ in practice from the original CSA model popularized in the United
States by Robyn Van En in the 1980s. Farmers have adapted CSA to suit farm-level characteristics
and ambitions, food products that are less common in CSA (such as meat, dairy, and grain), and
regional conditions. Here we define CSA as farm-based operations that have regular-and-direct sales
of local farm goods to households. They fall into two overarching categories:
1. Box Model, which has three subtypes
a. Single-Farm Box CSAs
b. Collaborative Box CSAs
c. Farm-Linked Aggregator CSAs
2. Farm Membership/Share Model