Each wave of expansion of the European Union has led to political tensions and conflict. Existing members fear their membership privileges will diminish and candidates are loath to concede the expected benefits of membership. Despite these conflicts, enlargement has always succeeded - so why does the EU continue to admit new states even though current members might lose from their accession? Combining political economy logic with statistical and case study analyses, Christina J. Schneider argues that the dominant theories of EU enlargement ignore how EU members and applicant states negotiate...