Information-Nonintensive Models of Rumour Impacts on Complex Investment Decisions

Nina Bo\v{c}kov\'a, Karel Doubravsk\'y, Barbora Voln\'a and Mirko Dohnal

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Abstract: This paper develops a qualitative framework for analysing the impact of rumours on complex investment decisions (CID) under severe information constraints. The proposed trend-based models rely on minimal data inputs in the form of increasing, decreasing, or constant relations. Sets of trend rules generate scenarios, and permitted transitions between them form a directed graph that represents system behaviour over time. The approach is applied in three interconnected models: financial CID, rumour-spreading dynamics, and their integration.

Date: 2025-08
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