Research Summary: Conditions for Social Trajectory Collapse: Agent-Based Simulation of Time-Geographic Trajectory Distributions

An agent-based simulation study, focusing on metropolitan concentration and regional development policies, projects a significant decline in 'trajectory diversity' across five major economies between 2026 and 2036. This diversity, representing recurring activity orientations towards neighborhoods, urban centers, and wider networks, is predicted to fall by 52.6% to 79.0%. The simulation also indicates rising cost burdens across all cases, with welfare declines specifically noted for Russia and Japan.

Why it matters

The projected decline in 'trajectory diversity' and rising cost burdens suggest fundamental shifts in societal interaction and resource allocation. These trends could impact urban planning, economic stability, and social cohesion, requiring proactive strategies to mitigate potential negative consequences.

Key insights

• Trajectory diversity, defined as the variety of recurring activity orientations, is projected to decline significantly (52.6-79.0%) between 2026 and 2036.
• The simulation involved mapping 2010 population shares to 2026 distributions for China, Russia, Japan, the United Kingdom, and the United States, and then simulating changes to 2036.
• Russia and Japan are anticipated to experience the largest increases in the share of the most common trajectory, indicating reduced diversity.
• The United States is predicted to see a contraction in diversity, despite a slight decline in the share of its most common trajectory.
• Cost burdens are expected to rise universally across all simulated countries.
• Welfare is projected to fall specifically in the Russian and Japanese cases.

Source

arXiv — Computers and Society — https://arxiv.org/abs/2610.02581