Fairness heuristic theory is an empirical framework: a reply to Arnadóttir.

In this article on fairness heuristic theory, we point out some important flaws in Arnadóttir's (2002) claim that fairness heuristic theory is "not empirical," by which Arnadóttir meant that theory's predictions are knowable a priori, and are not contingent upon circumstances. To this end, we demonstrate that empirically testing effects predicted by fairness heuristic theory was and is important because this showed that the theory's propositions are not necessarily knowable a priori and are contingent upon circumstances. This implies that, according to Arnadóttir's definition, fairness heuristic theory clearly is an empirical framework. It would have been helpful if Arnadóttir had studied the fairness literature more thoroughly (as this would have easily revealed fairness heuristic theory to be not knowable a priori and to be contingent upon circumstances) and also if she had pointed out which of our studies fail to follow her line of reasoning. Our reply was written not as an attempt to defend fairness heuristic theory as we applaud, indeed are honored by, attempts to scrutinize our work in progress. Our only aim here was to point at some important flaws in the Arnadóttir article, because we think these will hamper rather than advance the science of psychology of justice.