“…Volunteers were in particular concerned with performing a rewarding activity Burgham and Downward (2005) synthesized in the following paragraphs. Studies on the individual level (or microlevel) dealt with (1) economic approaches such as the theory of human capital (Becker, 1962;Mincer, 1974) and the economic theory of behavior (Becker, 1976), (2) sociological perspectives including the theory of social capital (e.g., Coleman, 1988), role theory (Parsons, 1951), and social exchange theories (Homans, 1958;Thibault & Kelley, 1959), and (3) psychological standpoints such as motivation theories (Herzberg, 1968;Herzberg, Mausner, & Snyderman, 1959;Maslow, 1987) or psychological contract theory (Argyris, 1960;Levinson, 1962).…”