Final answer:
The right for someone to cross over your property is known as an easement, which is a type of property right allowing use or access to someone else's land for a specific purpose.
Step-by-step explanation:
If someone has a legal right to cross your property, this is commonly referred to as a easement. An easement is a property right that gives its holder an interest in land that's owned by someone else. It's typically the right to use or cross over someone else's property for a specific purpose. For instance, utility companies often have easements on the properties of homeowners to run power lines. Similarly, if you buy a property landlocked by others, you may have an easement that allows you to cross a neighbor's land to access yours.
Property rights are crucial to understand in this context. They clarify legal responsibilities and ownership, helping to prevent disputes and ensuring that any infringements of such rights are compensated for. As noted by the economist Ronald Coase, well-defined property rights can lead to solutions that minimize economic costs associated with property use and can prevent endless legal disputes.