A form of marriage resting on coercion, and... the custom of ownership... The two institutions are not distinguishable in the initial phase of their development; both arise from the desire of the successful men to put their prowess in evidence by exhibiting some durable result of their exploits. Both also minister to that propensity for mastery which pervades all predatory communities. From the ownership of women the concept of ownership extends itself to include the products of their industry, and so there arises the ownership of things as well as of persons.