Community Supported Agriculture (CSA) has undergone both a rapid increase in growth and
interest over the last two decades. As such, the amount of literature on the subject has also
increased. However, there are few, if any, theoretical models of supply for CSA memberships
(shares) that have been developed from CSA farm data. This paper uses both survey and
anecdotal data from the Roxbury Biodynamic Farm, one of the largest CSA in the United States,
to present a theory of supply for CSA membership. Included in the discussion is the consideration
that CSA farms are not profit maximizing and that the farmers (i.e. the suppliers) knowingly take
on the responsibilities and earnings associated with a CSA.