Activity theory
Activity theory (AT; ) is an umbrella term for a line of eclectic social sciences theories and research with its roots in the Soviet psychological activity theory pioneered by Lev Vygotsky , Alexei Leont'ev and Sergei Rubinstein. These scholars sought to understand human activities as systemic and socially situated phenomena and to go beyond paradigms of reflexology (the teaching of Vladimir Bekhterev and his followers) and classical conditioning (the teaching of Ivan Pavlov and his school), psychoanalysis and behaviorism. It became one of the major psychological approaches in the former USSR, being widely used in both theoretical and applied psychology, and in education, professional training, ergonomics, social psychology and work psychology.
James Duesenberry
James Stemble Duesenberry (July 18, 1918 – October 5, 2009) was an American economist. He made a significant contribution to the Keynesian analysis of income and employment with his 1949 doctoral thesis "Income, Saving and the Theory of Consumer Behavior". Kenneth Arrow believed that it offered "one of the most significant contributions of the postwar period to our understanding of economic behavior". His theory, however, later disappeared from standard textbooks, although some, such as Robert H. Frank, argue that it outperforms the alternative theories that displaced it in the 1950s.