Economic Efficiency of Environmental Investments and Their Impact on Key Sectors of the Regional Economy: Agriculture and Healthcare

The objective of the research – to establish the relationship between the volume of environmental funding and key results in the agro-industrial complex (AIC) and the regional healthcare system. The object of the research is the system of economic and medical-social relationships between environmental investments and key indicators of the AIC and healthcare in Krasnodar region. The empirical base is official statistics from Krasnodar region for 2019-2023. Over the analyzed period, a structural transformation of investment priorities was revealed: a shift from the dominance of water management projects (71.2 %) to a climate and air protection agenda (68.1 %), with the formation of a sustainable two-component financing model. A comprehensive analysis, including correlation and regression methods, revealed statistically significant relationships between the volume and structure of environmental investments and indicators of agricultural and healthcare development, confirming the hypothesis of an indirect impact of environmental investments on the economy of related regional sectors. A detailed study of the problem revealed a nonlinear relationship between environmental investments in period "t" and the volume of agricultural production in period "t + 1". An optimal investment threshold (≈ 9.1 million rubles) was identified; exceeding this threshold leads to reduced returns and the effect of environmental overstrain. A regression analysis was conducted to comprehensively assess the impact of environmental factors on public health. The results allowed us to construct a highly accurate polynomial model (R2 = 0.9627), demonstrating the presence of a threshold effect in the relationship between environmental investments and the general morbidity rate of the population. The practical significance of the study is confirmed by the potential application of the results to optimize budget planning and develop differentiated government support measures for the agro-industrial complex, considering the identified patterns of impact of environmental investments on the economies of related regional sectors.