 The literature on belief merging includes the study of the strategic manipulation problem (Evaraere et al. 2007). When an aggregation procedure is not strategy-proof, an individual who has a preference over the possible outcomes can manipulate the result by lying on her true beliefs and thus obtain an outcome closer to her true preferences. In general, merging operators are not strategy-proof when Hamming distance is used, whereas they are strategy-proof when the drastic distance is employed. For a recent survey of results on strategic behaviour in judgment aggregation, see (Baumeister et al. 2017).