The problems of account of both positive and negative external effects of economic entities are considered. It forms preconditions for increase of ecological-economic efficiency of economic decisions on the planning stage due to adjustment of real targeting in course of emergence of both positive and negative external and internal effects of producing economic agents. Account of external effects enables efficient ecological-economic substantiation of economic decisions concerning regional social, ecological and economic development, which in its turn provides the increased efficiency of functioning of regional ecological-economic systems. 

external effect, internal effect