TY JOUR TI Theoretical and methodological aspects of sustainable development of the socio-economic Agro-system of the Southern Federal District KW economic essence KW sustainability KW sustainable development KW growth KW territories KW agricultural business KW levels of sustainability KW agro-system KW methods KW socio-economic development KW agro-industrial complex KW Southern Federal District (Southern Federal District) JO JOURNAL OF MONETARY ECONOMICS AND MANAGEMENT AU Saltanova, A.G. PY 2026 IS 0 PB ITBO University