The Copeland Cap is a constitutional amendment passed in 1977 which limits the growth in State appropriations to the growth in the TN economy as measured by personal income unless the General Assembly votes to override this cap.. The law is very explicit and says "appropriations. Bill Hobbs' post yesterday lays out some of the questions. Here is a video of a discussion from the Monday House Floor session where Dale Sims, with the Comptroller's office, says YES the Copeland cap has been computed with revenues and not appropriations. Has this allowed Govt to grow faster than it should have? Research is being done to find the answer.