Which of the following is a feature that indicates land is unique?

Land is considered unique due to its permanent and durable nature. This characteristic means that land does not wear out or diminish over time like many other goods can. Each parcel of land has distinct geographic features, locational advantages, and zoning classifications that cannot be replicated exactly, which contributes to its uniqueness. The permanence of land also implies that it is always available for use or development, making it a stable asset in real estate and taxation contexts.

In contrast, the other options present attributes that do not signify uniqueness. For instance, infinite supply suggests that land is abundantly available, which contradicts the principle of uniqueness since every piece of land is distinct in location. A single-use designation refers to specific zoning restrictions rather than inherent qualities of the land itself, thereby not addressing its uniqueness. Lastly, the ability to be replicated directly opposes the idea of uniqueness, as it implies that land could be produced or reproduced, which is not possible. Thus, the permanence and durability of land is what truly affirms its unique characteristics.