Evolutionary stability is a necessary condition for imitative dynamics of policy learning and innovation to come to a rest. We apply this concept to profit tax competition in a regime where a common and consolidated profit tax base for multi-jurisdictional firms is divided among governments by means of formulary apportionment. In evolutionary play, governments exhibit aggregate-taking behavior: when comparing their performance with others, they ignore their impact on the consolidated tax base. Consequently, evolutionarily stable tax rates are less efficient than tax rates in best-response tax competition. / Series: WU International Taxation Research Paper Series