In this paper, the results of communication research in the system of network structure and economic agents as its elements are delivered. The system is of a closed type as agents produce and consume goods made by themselves. Exchanges are made in volumes determined by Leontief’s intersectoral balance. Communication act consists of two main parts: in the first part one agent delivers its product to another agent and in the second part money is returned as a payment for the delivered product. To investigate the communication process the simulating model using agent-oriented technology was developed. Agents use different communication strategies and this fact greatly influences system’s macro-parameters. Experiments were done on the basis of simulation and real data reflecting the economic relations between the business entities of the municipality. The relationship of the duration of communication process and agents exchange strategies under the conditions of financial constraints was revealed and analyzed.