Generative AI as a Non-Convex Supply Shock: Market Bifurcation and Welfare Analysis

• URL: http://arxiv.org/abs/2601.12488v1
• Date: Sun, 18 Jan 2026 17:00:40 GMT
• Title: Generative AI as a Non-Convex Supply Shock: Market Bifurcation and Welfare Analysis
• Authors: Yukun Zhang, Tianyang Zhang,
• Abstract summary: We show how the GenAI cost shock reshapes the market into exit AI, and human segments, generating a -class hollow'' output.<n>We conclude that optimal governance must be toward laissez-faire congestion management.
• Score: 4.887749221165767
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The diffusion of Generative AI (GenAI) constitutes a supply shock of a fundamentally different nature: while marginal production costs approach zero, content generation creates congestion externalities through information pollution. We develop a three-layer general equilibrium framework to study how this non-convex technology reshapes market structure, transition dynamics, and social welfare. In a static vertical differentiation model, we show that the GenAI cost shock induces a kinked production frontier that bifurcates the market into exit, AI, and human segments, generating a ``middle-class hollow'' in the quality distribution. To analyze adjustment paths, we embed this structure in a mean-field evolutionary system and a calibrated agent-based model with bounded rationality. The transition to the AI-integrated equilibrium is non-monotonic: rather than smooth diffusion, the economy experiences a temporary ecological collapse driven by search frictions and delayed skill adaptation, followed by selective recovery. Survival depends on asymmetric skill reconfiguration, whereby humans retreat from technical execution toward semantic creativity. Finally, we show that the welfare impact of AI adoption is highly sensitive to pollution intensity: low congestion yields monotonic welfare gains, whereas high pollution produces an inverted-U relationship in which further AI expansion reduces total welfare. These results imply that laissez-faire adoption can be inefficient and that optimal governance must shift from input regulation toward output-side congestion management.

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