The paper aims to analyse and propose ways of measuring the synergistic effect that resource allocation to intelligence assets (activities) can have on country’s sustainable development and its subsystems. The methodology of adequate portfolio is used in order to determine the optimal structure of resources distributed to each group of intelligence assets - planning and data mining, analytical processing and reporting. Applying the proposed methodology and using expert valuations, the synergistic effect on sustainability is measured and expressed in terms of value added/resources saved, their reliability and riskiness. Moreover, this effect impacts all the subsystems in the general scheme of country sustainability, and, in turn, each subsystem can positively influence business value in the particular field of activity.