Principal Fairness for Human and Algorithmic Decision-Making

Using the concept of principal stratification from the causal infer-ence literature, we introduce a new notion of fairness, called principal fair-ness, for human and algorithmic decision-making. Principal fairness states that one should not discriminate among individuals who would be similarly affected by the decision. Unlike the existing statistical definitions of fair-ness, principal fairness explicitly accounts for the fact that individuals can be impacted by the decision. This causal fairness formulation also enables on-line or post-hoc fairness evaluation and policy learning. We also explain how principal fairness relates to the existing causality-based fairness criteria. In contrast to the counterfactual fairness criteria, for example, principal fairness considers the effects of decision in question rather than those of protected attributes of interest. Finally, we discuss how to conduct empirical evaluation and policy learning under the proposed principal fairness criterion.