Shoplifting

The word 'Property' has a particular meaning in Socialist theory, and it makes a distinction between personal property (stuff that you own for your own use) and private property, which includes things like the means of production (think factories), natural resources, etc.

Tl;dr version.

Long version:

In a private property system, property rules are organized around the idea that various contested resources are assigned to the decisional authority of particular individuals (or families or firms). Thomas Merrill (2012) calls this ‘the property strategy’ and contrasts it with bureaucratic governance or the management of resources through group consensus. In a system of private property, the person to whom a given object is assigned (e.g., the person who found it or made it) has control over the object: it is for her to decide what should be done with it. In exercising this authority, she is not understood to be acting as an agent or official of the society. She may act on her own initiative without giving anyone else an explanation, or she may enter into cooperative arrangements with others, just as she likes. She may even transfer this right of decision to someone else, in which case that person acquires the same rights she had. In general the right of a proprietor to decide as she pleases about the resource that she owns applies whether or not others are affected by her decision. If Jennifer owns a steel factory, it is for her to decide (in her own interest) whether to close it or to keep the plant operating, even though a decision to close may have the gravest impact on her employees and on the prosperity of the local community.

Though private property is a system of individual decision-making, it is still a system of social rules. The owner is not required to rely on her own strength to vindicate her right to make self-interested decisions about the object assigned to her: if Jennifer’s employees occupy the steel factory to keep it operating despite her wishes, she can call the police and have them evicted; she does not have to do this herself or even pay for it herself. So private property is continually in need of public justification—first, because it empowers individuals to make decisions about the use of scarce resource in a way that is not necessarily sensitive to others’ needs or the public good; and second, because it does not merely permit that but deploys public force at public expense to uphold it.