kill. Lee found this out when he purchased an entire cow as a gift for the group he was living with, and was teased for weeks afterward about it (since obtaining that much meat could be interpreted as showing off). Another example is the Australian Aboriginals of Groote Eylandt and Bickerton Island, off the coast of Arnhem Land, who have arranged their entire society—spiritually and economically—around a kind of gift economy called renunciation. According to David H. Turner, in this arrangement, every person is expected to give everything of any resource they have to any other person who needs or lacks it at the time. This has the benefit of largely eliminating social problems like theft and relative poverty. However, misunderstandings obviously arise when attempting to reconcile Aboriginal renunciative economics with the competition/scarcity-oriented economics introduced to Australia by European colonists. Variables in theory and research The social status variables underlying social stratification are based in social perceptions and attitudes about various characteristics of persons and peoples. While many such variables cut across time and place, the relative weight placed on each variable and specific combinations of these variables will differ from place to place over time. One task of research is to identify accurate mathematical models that explain how these many variables combine to produce stratification in a given society. Grusky (2011) provides a good overview of the historical development of sociological theories of social stratification and a summary of contemporary theories and research in this field. While many of the variables that contribute to an understanding of social stratification have long been identified, models of these variables and their role in constituting social stratification are still an active topic of theory and research. In general, sociologists recognize that there are no "pure" economic variables, as social factors are integral to economic value. However, the variables posited to affect social stratification can be loosely divided into economic and other social factors. Economic Strictly quantitative economic variables are more useful to describing social stratification than explaining how social stratification is constituted or maintained. Income is the most common variable used to describe stratification and associated economic inequality in a society. However, the distribution of individual or household accumulation of surplus and wealth tells us more about variation in individual well-being than does income, alone. Wealth variables can also more vividly illustrate salient variations in the well-being of groups in stratified societies.