 The initial argument that Marx must have thought that capitalism is unjust is based on the observation that Marx argued that all capitalist profit is ultimately derived from the exploitation of the worker. Capitalism’s dirty secret is that it is not a realm of harmony and mutual benefit but a system in which one class systematically extracts profit from another. How could this fail to be unjust? Yet it is notable that Marx never explicitly draws such a conclusion, and in Capital he goes as far as to say that such exchange is “by no means an injury to the seller” (MECW 35: 204), which some commentators have taken as evidence that Marx did not think that capitalism was unjust, although other readings are possible.