Despite Australia's proximity and shared common law background, its case law is relatively seldom cited in New Zealand. The same is true of Australian citation of New Zealand case law. Undertaking a new, extensive study, the authors examine trends in citation of United Kingdom, New Zealand and Australian decisions in the New Zealand Law Reports in the 1950s, 1970s, 1990s and 2010s. Across that period the first two have essentially swapped places, suggesting an increased self-confidence in New Zealand's own common law resource. Australian citation, on the other hand, increased slightly in the 1970s and 1990s, before declining slightly. The authors examine areas of New Zealand law where Australian case law has proved more influential, and offer some qualitative explanations for the curious dearth of trans-Tasman citation, and mutual jurisprudential indifference, demonstrated by their quantitative analysis.