<P> Prior to the emergence of marketing courses, marketing was not recognised as a discipline in its own right; rather it was treated as a branch of economics and was often called applied economics . Subjects, which today might be recognised as marketing - related, were embedded in economics courses . Early marketing theories were described as modifications or adaptations of economic theories . </P> <P> The impetus for the separation of marketing and economics was due, at least in part, to economic's focus on production as the creator of economic value and general failure to investigate distribution . In the late 19th century and early 20th century, as markets became more globalised, distribution began to assume increasing importance . Some economics professors began to run courses examining various aspects of the marketing system, including "distributive and regulative systems ." Other courses, such as the "marketing of products" and the "marketing of farm - products" followed . As the first decades of the 20th century progressed, books and articles concerning marketing topics began to emerge . In 1936, the publication of the new Journal of Marketing gave marketing academics a forum for exchanging ideas and research methods and also gave the discipline a real sense of its own distinct identity as a maturing academic discipline . </P> <P> Several scholars have attempted to describe the evolution of marketing thought chronologically and to connect it with broader intellectual and academic trends . Bartels (1965) provided a brief account of marketing's formative periods, and Shah and Gardner (1982) briefly considered the development of the six dominant schools in contemporary marketing . However, these initial attempts have been criticised as overly descriptive . One of the first theorists to consider the stages in the development of marketing thought was Robert Bartels, who in The History of Marketing Thought, (1965) used a periodisation approach . He categorised the development of marketing theory decade by decade from the beginning of the 20th century: </P> <Ul> <Li> 1900s: discovery of basic concepts and their exploration </Li> <Li> 1910s: conceptualisation, classification and definition of terms </Li> <Li> 1920s: integration on the basis of principles </Li> <Li> 1930s: development of specialisation and variation in theory </Li> <Li> 1940s: reappraisal in the light of new demands and a more scientific approach </Li> <Li> 1950s: reconceptualisation in the light of managerialism, social development and quantitative approaches </Li> <Li> 1960s: differentiation on bases such as managerialism, holism, environmentalism, systems, and internationalism </Li> <Li> 1970s: socialisation; the adaptation of marketing to social change </Li> </Ul>

Briefly explain the history of marketing in nigeria