The article defines various interaction types and provides an overview thereof. A unified classification of interactions of entities on the commodity and service market has been considered.  The author pays special attention to the compatibility of finding partners and competitors before and after the interaction, including finding them through the integration (quasi-integration). He presents the variant of functional correspondence – compatibility of macro- and microsystems, and also the forms and types of compatibility depending on the parties’ interaction. A structural-functional dependence showing what the interaction (Vd) of enterprise entities should be like to achieve a high-degree compatibility of their work has been proposed.