Concentration in modern industry : theory, measurement and the U.K. experience

By B. Alford, L. Hannah, J. Kay. 1978

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Measuring Data (2022, background): “Diversity is also referred to as heterogeneity in many sciences (Rényi et al., 1961; Nunes et al., 2020) which have their own approaches to measure it, Hill numbers in ecology (Hill, 1973), Hannah–Kay indices in economics (Hannah and Kay, 1977).”
GST and its relatives do not measure differentiation (2008, background): “Economists have independently arrived at an analogous criterion (Hannah & Kay 1977).”
Partitioning diversity for conservation analyses (2010, background): “These measures are self-contradictory because they do not possess Hill’s (1973) doubling property, known in economics as the replication principle (Hannah & Kay, 1977; Ricotta, 2008).”
Measuring Competitive Balance in Professional Team Sports Using the Herfindahl-Hirschman Index (2007, unknown): “Bajo and Salas (2002), in order to separate the effects of changes in n and I on concentration, show that the Hannah and Kay (1977) family of concentration indices, which includes the HHI, is consistent with the family of generalized entropy measures of inequality (Cowell 2000) defined, for differ”