In this thesis I present a rights-based theory of exploitation. I argue that successful conceptions of exploitation should begin with the ordinary language claim that exploitation involves `taking unfair advantage'. Consequently, they must combine an account of what it means to take advantage of another with an account of when transactions are unfair. Existing conceptions of exploitation fail to provide adequate accounts of both aspects of exploitation. -/- Hillel Steiner and John Roemer provide convincing accounts of the unfairness involved in (...) exploitation, but because they fail to provide restrictive `advantage taking' conditions, their theories of exploitation include cases that we would not ordinarily describe as exploitations. Ruth Sample and Robert Goodin provide accounts that place a stronger emphasis on the attitudes involved in exploitation and the processes that bring it about. Unfortunately, these theories do not properly incorporate the unfairness aspect of exploitation. Consequently, they are either self-frustrating or incomplete. -/- I provide a conception of exploitation that combines both aspects. I claim that a bilateral, strictly Pareto improving, and voluntary transaction t between A and B is exploitative just in case (1) there exists an unrectified property rights violation at some point in the history of exchanges leading to t that (2) reduces B's bargaining power by altering her status quo point, and (3) the degree to which B's preferences are satisfied in t is less than it would be had B's bargaining power not been reduced (by the alteration of her status quo point). Further, (4a) A's egoistic preferences are better satisfied in t because B's bargaining power is limited, and (4b) if the previous conditions also hold for A, then the reduction in A's bargaining power is less than the reduction in B's bargaining power. Finally, (5) A truly believes the previous conditions hold. (shrink)