AbstractEconomists are increasingly being asked to study problems that require a systems approach. This paper reports an empirical application of industrial dynamics to a problem of an industry system. A second generation model was developed and used to appraise alternative supply control policies designed to reduce fluctuations in marketings of frozen concentrated orange juice and grower profits. Policies that controlled long‐run supplies by constraining tree plantings appeared to have the most potential for success. Policies designed to control market supplies on a year‐to‐year basis actually encouraged new tree plantings which created long‐run supply problems.