Coercion includes, besides preventing a person from doing what he chooses, making his choice less eligible by threats; restraint includes any action designed to make the exercise of choice impossible and so includes killing or enslaving a person. But neither coercion nor retraint includes competition. In terms of the distinction between "having a right to" and "being at liberty to,"...all men have, consistently with the obligation to forbear from coercion, the liberty to satisfy if they can such at least of their desires as are not designed to coerce or injure others, even though in fact, owing to scarcity, one man's satisfaction causes another's frustration. In conditions of extreme scarcity this distinction between competition and coercion will not be worth drawing; natural rights are only of importance "where peace is possible" ( Locke). Further, freedom (the absence of coercion) can be valueless to those victims of unrestricted competition too poor to make use of it; so it will be pedantic to point out to them that though starving they are free.
H. L. A. Hart
The Realpolitik and Human Rights