In denying World Haecceitism, Lewis forgoes a one-to-one correspondence between maximal possibilities and possible worlds. This feature proves significant in several discussions about the tenability of “cheap haecceitism.” Graff Fara (2009) argues that, by rejecting World Haecceitism, cheap haecceitism cannot satisfactorily interpret modal logic enriched with an actuality operator. Kment (2012) also argues that cheap haecceitism delivers an inadequate treatment of chances and counterfactuals, while Stalnaker (2008: 69–71) suggests that semantic considerations support World Haecceitism over cheap haecceitism. On early challenges to counterpart theory, see Kripke (1980) and Hazen (1979). On counterpart theory, actuality, and haecceitism, see Baltimore (2014), Cowling (2013), and Russell (2013a, 2013b).