竞争性（英文：Rivalry）是经济学中财产的一种特征。一件货品的竞争性由完全竞争到非竞争不等。这特性有时也被称为可减的（subtractable）或不可减的（non-subtractable）。有竞争性的货品被消费者行使消费时，会限制（或避免）其他消费者对该产品进行消费。或者说，一类财产无法被其他消费者消费。相反，完全非竞争性的货品要增加产量时的成本是零。非竞争性不代表总生产成本是零，只是额外增加产量时的成本是零。现实中，很少货品是完全非竞争的，因为竞争性有程度之别。例如，道路及网络带宽的使用在未饱和时是非竞争性的，但出现拥塞时，更多的用户就意味着其他人的速度减慢。因此，经济学理论将竞争性视为一连续光谱，而不是二元分类,，大部分货品都界乎完全竞争和非竞争两极之间。

In economics, rivalry is a characteristic of a good. I.e. merchandise. A good can be placed along a continuum ranging from rivalrous (rival) to non-rival. The same characteristic is sometimes referred to as subtractable or non-subtractable. A rival (subtractable) good is a good whose consumption by one consumer prevents simultaneous consumption by other consumers. Put differently, a good is considered non-rival (non-subtractable) if, for any level of production, the cost of providing it to a marginal (additional) individual is zero. Non-rivalry does not imply that the total production costs are low, but that the marginal production costs are zero. In reality, few goods are completely non-rival as rivalry can emerge at certain levels. For instance, road (or internet) use is non-rival up to a certain capacity, after which congestion means that each additional user decreases speed for others. For that, recent economic theory views rivalry as a continuum, not as a binary category, where many goods are somewhere between the two extremes of completely rival and completely non-rival.