Theories of consumption have been a part of the field of sociology since its earliest days, dating back, at least implicitly, to the work of Karl Marx in the mid-to-late nineteenth century. Sociologists view consumption as central to everyday life, identity and social order. Many sociologists associate it with social class, identity, group membership, age and stratification as it plays a huge part in modernity. Thorstein Veblen's (1899) The Theory of the Leisure Class is generally seen as the first major theoretical work to take consumption as its primary focus. Despite these early roots, research on consumption began in earnest in the second half of the twentieth century in Europe, especially Great Britain. Interest in the topic among mainstream US sociologists was much slower to develop