<p>Parameter regimes for 0 < <i>p</i> < 1/2.</p>

We develop a simple population model in which current representation changes each type’s per-capita effective rate of maintaining or expanding its presence, while corrective action responds to the gap from a reference-population share. The model yields three main results.

First, an exclusionary state can remain stable when corrective action is present but weak relative to representation-dependent structural feedback. Second, the corrective strength required to destabilize exclusion is greater for a focal type that is rarer in the reference population. Third, avoiding complete exclusion is not the same as attaining proportional representation: with finite corrective strength, the stable long-run share can remain below the reference share.