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  "story": {
    "story_id": "mp-2026-09-07-002",
    "source_story_id": "tmp-feature-correlated-llm-market-risk",
    "edition_id": "mp-2026-09-07-morning-0060",
    "edition_url": "https://themachinepress.com/edition/2026-09-07",
    "position": 2,
    "story_type": "secondary",
    "section": "safety-security",
    "editorial_classification": "editorial",
    "headline": "Smarter Traders Began Moving Like One Trader",
    "slug": "smarter-traders-began-moving-like-one-trader",
    "dek": "An agent-based simulation found that capability increased correlated behavior—helpful under shared accuracy, but a common risk floor when every agent saw the same misinformation.",
    "summary": "An agent-based simulation found that capability increased correlated behavior—helpful under shared accuracy, but a common risk floor when every agent saw the same misinformation.",
    "body_text": "The study models markets populated by language-model traders and asks what happens when better individual reasoning is built from similar training and architectures. The authors report that frontier models acted more alike as capability rose. When the shared view was correct, adding agents reduced market-level risk; when all agents received the same misinformation, correlation became a liability that participation could not diversify away. The result is a systems warning rather than a live-market forecast: it comes from an agent-based simulation, and the authors explicitly leave whether the pattern transfers to other domains as an open empirical question.",
    "why_it_matters": "An agent-based simulation found that capability increased correlated behavior—helpful under shared accuracy, but a common risk floor when every agent saw the same misinformation.",
    "limitations": [
      "When the shared view was correct, adding agents reduced market-level risk; when all agents received the same misinformation, correlation became a liability that participation could not diversify away."
    ],
    "importance": 9,
    "canonical_url": "https://themachinepress.com/story/mp-2026-09-07-002/smarter-traders-began-moving-like-one-trader",
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    "first_published_at": "2026-09-07T09:00:00.000-04:00",
    "modified_at": "2026-09-07T09:00:00.000-04:00",
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        "text": "An agent-based simulation found that capability increased correlated behavior—helpful under shared accuracy, but a common risk floor when every agent saw the same misinformation.",
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          "source-2026-09-07-002"
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        "qualification": "When the shared view was correct, adding agents reduced market-level risk; when all agents received the same misinformation, correlation became a liability that participation could not diversify away."
      }
    ],
    "source_ids": [
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    "tags": [
      "multi-agent systems",
      "financial markets",
      "correlated risk"
    ],
    "image_url": "https://themachinepress.com/issues/2026-09-07/feature-correlated-agents.png",
    "corrections": []
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  "sources": [
    {
      "source_id": "source-2026-09-07-002",
      "title": "arXiv preprint 2609.04373",
      "publisher": "arXiv",
      "url": "https://arxiv.org/abs/2609.04373",
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      "source_type": "primary_research",
      "is_primary_source": true,
      "published_at": "2026-09-03T14:37:56.000-04:00",
      "accessed_at": "2026-09-07T08:20:00.000-04:00",
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  "publisher": {
    "name": "The Machine Press",
    "url": "https://themachinepress.com",
    "description": "A daily newspaper for the age of artificial intelligence."
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  "cite_this_report": {
    "title": "Smarter Traders Began Moving Like One Trader",
    "publisher": "The Machine Press",
    "published_at": "2026-09-07T09:00:00.000-04:00",
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