In this monograph authors discuss theoretical constructions in the form of analytical formulas which explain general economic growth process for agriculture sector. Economic growth is referred to mainstream economic models, and is used interchangeably with the notion of output increase. This study analyses and explains growth both in terms of its sources and its mechanism. The analysis of growth sources and its mechanism is consider a base for the construction of agricultural policies. Authors' investigation refer to the general theories of growth. In this framework they provide links between general economy and agriculture economics growth theory. Theoretical constructions are extensively illustrated with the use of Economic Accounts for Agriculture. Therefore, readers can benefit from theoretical description of growth processes supported with evidence for European Union countries.