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Municipal amalgamation (or merger or consolidation) is commonly employed in countries around the world to improve efficiency in public service. While mergers occur among jurisdictions of all sizes, the municipal amalgamation discourse is typically limited to one national setting and a focus on mergers of larger local jurisdictions. The existing municipal amalgamation literature pays little attention to predicate conditions for successful mergers. This study seeks to address these deficiencies by examining the premerger conditions and effects of municipal amalgamations that recently took place in four small jurisdictions of similar size in Thailand and the United States.

A holistic multiple case study approach was employed. These two cases share a geographical attribute: one municipal jurisdiction encircled by another.

The evidence indicates that factors associated with what the researchers refer to as “familiarity” facilitated both successful approval of and outcomes resulting from the amalgamation actions. While the study's findings align with international research regarding the potential for reducing administrative support costs through consolidation, its findings diverge from existing international evidence in that the evidence indicates operating effectiveness and efficiency improvements. Economies of scope and marginal economies of scale are in evidence. Although findings from this study indicate that there might be problematic effects regarding political representation and participation, in that the consolidated jurisdictions remain small in size, negative citizen engagement and participation consequences may be less than that evidenced in larger consolidated jurisdictions.

The study introduces the “familiarity” theorem as a theoretical lens to assist in understanding the cases.