Ein Markt last sich allgemein als okonomischer Ort des Tausches charakterisieren1, wo Angebot und Nachfrage aufeinandertreffen2. In einer differenzierteren Betrachtung bezeichnet von Stackelberg den Markt als „gedankliche Zusammenfassung aller Kauf- und Verkaufakte eines bestimmten Gutes innerhalb eines bestimmten Gebietes und Zeitraumes“3. Mit den drei in dieser Definition angedeuteten Dimensionen Sache, Raum und Zeit wird ublicherweise eine Marktabgrenzung beschrieben, mittels derer ein relevanter (Teil-)Markt zu partialanalytischen Zwecken vom Gesamtmarktgefuge, verstanden als System interdependenter Teilmarkte4, abgegrenzt wird5.

Ad-hoc-Publizität im allgemeinen Regulierungskontext

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