{"id":"frontrunner-movement","type":"concept","title":"Frontrunner movement","created":"2026-07-24","status":"Evidence available","authors":["Upstream Zero"],"edges":[{"rel":"part-of","to":"recommendation-survivability"},{"rel":"observes","to":"requirements"}],"summary":"How the leading vendor changes as requirements accumulate.","question":"Does the vendor that leads the opening set keep its lead, and if not, at which requirement does it lose it?","pubState":"published","body":"Frontrunner movement studies the vendor at the front of the recommendation.\nThe leader can keep its position, be demoted, or be eliminated as requirements\nare added, and the change can target the leading position rather than a\nspecific vendor.\n\nThe core question is whether the opening leader keeps its lead, and where it\nloses it. What remains open is whether the position-based movement holds across\nevaluators.","url":"/concepts/frontrunner-movement","machineUrl":"/objects/frontrunner-movement","referencedBy":[{"from":"incumbent-head-inversion","rel":"part-of"},{"from":"E-041","rel":"part-of"},{"from":"E-043","rel":"part-of"},{"from":"E-045","rel":"part-of"}],"_meta":{"site":"Upstream Zero · Commercial Intelligence for AI-Mediated Commercial Evaluation","version":"0.1","note":"Claims are presented at their evidence tier; Narrated is the lowest. Verify by walking edges, not by trusting us."}}