 there are two reasons … why the Simulation Theorist should prefer [a one mechanism hypothesis]: … first, the postulation of two mechanisms is less economical than the postulation of one; second, … we have very good reasons to think that imagination-based decision making does not operate in isolation from the subject’s real beliefs and desires. … If imagination and belief operate under a system of inferential apartheid—as the two-mechanisms view has it—how could this happen? (Currie &amp; Ravenscroft 2002: 67–68)