Opinion of the Court
a statistical disparity must fail if the plaintiff cannot point to a defendant’s policy or policies causing that disparity. A robust causality requirement ensures that "[r]acial imbalance . . . does not, without more, establish a prima facie case of disparate impact" and thus protects defendants from being held liable for racial disparities they did not create. Wards Cove Packing Co. v. Atonio, 490 U. S. 642, 653 (1989), superseded by statute on other grounds, 42 U. S. C. §2000e–2(k). Without adequate safeguards at the prima facie stage, disparate-impact liability might cause race to be used and considered in a pervasive way and "would almost inexorably lead" governmental or private entities to use "numerical quotas," and serious constitutional questions then could arise. 490 U. S., at 653.
The litigation at issue here provides an example. From the standpoint of determining advantage or disadvantage to racial minorities, it seems difficult to say as a general matter that a decision to build low-income housing in a blighted inner-city neighborhood instead of a suburb is discriminatory, or vice versa. If those sorts of judgments are subject to challenge without adequate safeguards, then there is a danger that potential defendants may adopt racial quotas—a circumstance that itself raises serious constitutional concerns.
Courts must therefore examine with care whether a plaintiff has made out a prima facie case of disparate impact and prompt resolution of these cases is important. A plaintiff who fails to allege facts at the pleading stage or produce statistical evidence demonstrating a causal connection cannot make out a prima facie case of disparate impact. For instance, a plaintiff challenging the decision of a private developer to construct a new building in one location rather than another will not easily be able to show this is a policy causing a disparate impact because such a one-time decision may not be a policy at all. It may also be difficult to establish causation because of the mul-
