We propose a substrate-based mechanism for cosmic inflation and the emergence of gravity based on a transition from pre-Standard-Model excitations to Standard Model matter. The central hypothesis of the framework is that the earliest stages of cosmic evolution were dominated by substrate-scale or pre-Standard-Model excitations whose interaction with the underlying substrate differed fundamentally from that of later Standard Model particles and bound states. Within the suppression framework, gravity arises from stable suppression gradients generated through interactions between matter and the substrate. Standard Model matter is assumed to interact strongly with the substrate and therefore generates the suppression gradients responsible for gravitational phenomena. The earliest pre-Standard-Model excitations, however, are hypothesized to have interacted only weakly with the substrate. As a consequence, despite the extremely high energy densities present in the early universe, gravitational localization remained weak and large-scale collapse was strongly suppressed. The resulting cosmological state naturally favored expansion over localization. Inflation is therefore interpreted not as the consequence of a separate inflaton field, but as the dynamical behavior of a universe dominated by weakly substrate-coupled excitations. Under such conditions, the formation of stable suppression gradients is inefficient, allowing a nearly uniform and rapidly expanding universe to emerge naturally.