A unilateral breach of contract involves an indirect use of physical force: it
consists, in essence, of one man receiving the material values, goods or
services of another, then refusing to pay for them and thus keeping them by
force (by mere physical possession), not by right—i.e., keeping them without
the consent of their owner. Fraud involves a similarly indirect use of force:
it consists of obtaining material values without their owner’s consent, under
false pretenses or false promises.