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Displacement and Access Impact Review

Impact review — instantiates Internal Capacity Deepening

Assesses who gets displaced, priced out, crowded, or excluded by an internal-growth move, disaggregated by group, and whether the mitigations actually restore their legitimate access.

Densifying internal capacity looks efficient in the aggregate and can still quietly push someone out. Displacement and Access Impact Review is the assessment that asks who bears the cost of an intensification move — who is displaced, priced out, crowded, or excluded — and, crucially, asks it disaggregated by group and place rather than on average, because a change that raises capacity-per-person overall can concentrate its harm on one community. Its defining test is not "did average access improve" but "did any legitimate access get destroyed, and do the mitigations genuinely restore it." That shifts the review from a headline number to a distributional judgement, and from mitigations that merely exist to mitigations that are actually adequate.

Example

A city library system intensifies its central branch — longer hours, more programming, shared study space — and funds it partly by trimming the hours of two neighborhood branches. On the aggregate ledger, capacity per resident rises. The review disaggregates and finds a concentrated harm: residents of a low-income neighborhood without reliable transit lose their walkable branch, a facially neutral efficiency move landing as a real access loss on one group — a disparate impact.[1] It then tests the proposed mitigations for adequacy, not mere presence: a bookmobile route and extended hold-pickup at a nearby community center are judged against whether they actually restore usable access for those residents, and the schedule is adjusted where they fall short before the plan is allowed to proceed.

How it works

  • Disaggregate the impact. Effects are read by group and place — income, disability, geography — not averaged, so a concentrated harm can't hide behind an improved aggregate.
  • Center legitimate access. The thing to be preserved is defined up front (who is entitled to what access), so "efficiency" can't silently redefine it away.
  • Judge mitigation adequacy. Each carve-out or mitigation is tested against whether it restores access for the burdened party, not merely whether it was offered.

Tuning parameters

  • Subgroup granularity — which cuts the review disaggregates by. Finer cuts catch narrower harms but multiply the analysis and can slice to noise.
  • Harm threshold — how much displacement counts as unacceptable rather than tolerable. A strict threshold protects more but blocks more.
  • Mitigation-adequacy bar — present versus sufficient. Raising the bar from "offered" to "actually restores access" is what keeps the review from becoming cover.
  • Access definition — how broadly "legitimate access" is drawn, which sets who has a claim to protect.
  • Standing — who among the affected can contest the finding, and through what channel.

When it helps, and when it misleads

Its strength is catching the concentrated harms that aggregates hide, and holding mitigations to a standard of adequacy — which is what keeps internal densification from buying efficiency with someone else's access.

Its failure modes are those of any impact review: it becomes box-ticking cover ("we did a review") when adequacy isn't actually judged; it measures average access while a subgroup is severely harmed; and it lets a disparate impact through under a facially neutral policy. The discipline is to disaggregate rather than average, to judge mitigations on whether they restore access rather than whether they exist, and to give the affected parties real standing to contest a finding — so the review has teeth rather than serving as a permission slip.

How it implements the components

  • distributional_and_displacement_guardrail — the core test: identifies who is displaced, priced out, crowded, or excluded, read by group and place rather than averaged into a headline.
  • local_fit_exception_process — evaluates whether targeted carve-outs and mitigations actually restore legitimate access to the parties the growth move would otherwise burden.

It does not guard operational slack (protected_capacity) — that's the Slack-Erosion Test; nor service quality and rework (quality_consistency_guardrail) — that's the Capacity Utilization Dashboard; and it informs, but does not make, the go/no-go (intensification_expansion_crossover_rule) at the Footprint-Expansion Decision Gate.

References

[1] Disparate impact — a facially neutral policy that falls more heavily on a particular group. Naming it is what turns an "on average it improved" defense into a question the review must actually answer: improved for whom, and at whose cost. ↩