ECONOMIC AND MATHEMATICAL MODEL FOR THE DEVELOPMENT OF EXTERNAL INVESTMENT SYSTEMS FOR ENTERPRISES IN WARTIME AND POST-WAR CONDITIONS

The article argues that applying a comprehensive approach that combines Computable General Equilibrium (CGE) models and Agent-Based Models (ABM) is the most appropriate method for developing an economic and mathematical model for the evolution of external investment systems for enterprises in wartime and post-war conditions. This integration enables consideration of both macroeconomic factors affecting overall economic development and the behavior of individual economic agents, particularly enterprises and investors. It is demonstrated that the incorporation of stochastic elements into investment and productivity models, as well as the transition to dynamic modeling of macroeconomic variables and risks, significantly enhances the accuracy of simulating economic processes under heightened uncertainty, which is typical of wartime and post-war periods. This allows for a more precise representation of the effects of random shocks and uncertain factors on investment processes and economic growth. It is substantiated that accounting for various types of investors and their strategies, as well as the impact of innovation and technological advancement on enterprise productivity, is critically important for building a resilient external investment system. This supports the formulation of effective strategies for attracting investment, especially in the context of post-war economic recovery, where innovation can be a key driver of growth. The developed model, which includes structural changes in the economy and the adaptation of enterprises to these changes, makes it possible to assess the impact of sectoral transformations on overall economic indicators. This is essential for designing policies and strategies aimed at ensuring sustainable economic development in the post-conflict period. Therefore, the proposed economic and mathematical model provides a comprehensive toolset for analyzing and forecasting the development of external investment systems under wartime and post-war conditions. It ensures effective economic management, contributes to recovery and sustained economic growth, and creates a favorable investment climate.