The binding assignment condition mimics societies in which some are born rich and some are born poor, and social mobility is prohibited, and societies in which government or organizations assign desirable and undesirable jobs to different individuals and the assignment is binding. In contrast, the free competition condition is more similar to societies in which individuals are born equal and everyone may become richer or poorer depending on how competitive he or she is, and societies in which everyone can compete equally for the best jobs yet winners of the best jobs may lose their jobs if they do not stay competitive. Of course, free competition and binding assignment are two extremes of a continuum; most reallife systems lie in between. Nevertheless, many modern societies are moving toward the direction of free competition: social status becomes more mobile, job switches become less difficult.