 First, according to the neoclassical account, exploitation is impossible under perfect competition. Whether this aspect of the neoclassical account is a bug or feature depends on whether one thinks that competitive markets and the pressures they can place on individuals—or the capitalist system, for Marxists—can be exploitative. A point against the neoclassical account is that it seems that conclusions about whether or not competitive markets can be exploitative should be the result of substantive moral argument and not merely settled by stipulative definition. On the other hand, the idea that market competition precludes at least certain causes of exploitation is compelling. Perfectly competitive markets exclude abuses of power by monopolists and monopsonists and the abuse of informational asymmetries (Wertheimer 1996). A competitive market is a context in which the price that one pays for goods and services is shaped by the availability of these resources (supply) and the degree to which others need or want them (demand).